Here are some ideas of what could be added to thaumic augmentation

1) Flux Battery
It works similarly to vis battery, but instead of vis it absorbs flux

2) Flux Backpack
Required for transferring unstable items associated with flux (unstable items - items that are destroyed after a small amount of time, causing a flux and warp)
In the interface, you need to put a jar with vitium and the indicator will show the charge level of the backpack, this charge is spent when transferring unstable items

3) Deep Void
Deep Void is a new dimension that can only be accessed from the Void. To get into Deep Void, you need to find a special building in Void (an interdimensional gate built by the ancients), and activate it with any spell made on an ancient lens. This building can be generated as one of the rooms in Eldritch Spire or as an independent building
Deep Void consists mainly of free space, in this space there are small islands and dilapidated buildings made of otherworldly stone (in which there is a good loot), also here you can find a giant citadel, in its "heart" there is a two-level matrix (columns, as well as pedestals are located both above and below, which makes this matrix look like a sand clock), behind the room with the matrix there is a room with a boss, behind which there is an important research, following which you can find crafts that created on the matrix
One of these crafts is an improved void siphon, which works three times faster than usual, but only works in the Void and Deep Void next to the Eldritch obelisks. In Deep Void, an improved void siphon produces, in addition to void seeds, fabric of space

4) Spaceless Fabrick
Spaceless Fabrick is late game material
One of these super-duper things is interdimensional armor, this armor has no durability, and protects only when it has impetus in it
Another of these super-duper things is the void lens, which has a capacity of 75, a speed of use on a level with medium one and has less debuffs to the force of action
Hollow Apparatus. The hollow apparatus is a tool that combines the functions of the primordial crusher primordial cutter and imbued thaumium hoe but a little bit better

5) Mind of Emptines
Mind of emptiness is a hidden research that allows you to make other bodies for yourself like in thaumic horizons.
Mind of Emptines itself is a construction that looks like a large zombie brain in a jar, but the brain is made of void metal, and instead of a jar, a tank with transparent glass, to which various pipes with essence are attached from above and below.
Also, in addition to this construction, bodies are needed, they are created in a special crafting station from various materials used in golemancy. In these bodies, you need to insert a special object, the interdimensional animator, which you need to pre-bind to mind of emptiness.
After you have installed the body and inserted the interdimensional animator into it, a menu opens on a special key, in which you can select one of the bodies tied by the interdimensional animator to your mind of emptiness, and then get it under control.
Being under the control of an additional body, your real body can die, but if this happens, the death menu will not appear on the screen, it will simply be written on the screen that someone killed you. The additional body works the same way as the real one, but it has the characteristics (damage, speed, height of jump, buoyancy, flight, etc.) that were selected at the crafting station. By controlling an additional body, you can change its Nickname (which can be done without entering the body, in the menu where the interdimensional animator is inserted), as well as a skin from a set of presets and skins of players who have ever been in the world.

6) New spells

1. Beam - this is obvius (you can configure the range, reflection from blocks, reflection from mobs, penetration through mobs).
2. Tenatackles - tentacles come out of the surface of the block (or from the caster's hand) and attack mobs that are close to them (you can configure the length, number, and reaction to different mobs).
3. Cone - the flow is at a certain angle, which loses its strength at a distance (you can configure the angle, range, loss of power at a distance.

7) New spell effects

1. Darkness (Tenebrae) - changes level of light, does damage, destructs lumoses, dazzles.
2. Chaos - costs a lot, does big damage, gives random effects, explodes, requires all usual crystals, (if it is possible) lens shimmers with rainbow colors
3. Fertilizer (Herba) - fertilizes the soil ._.
4. Transformation (Bestia) - allows you to turn into a mob or another player for a while
5. Emptiness (primordial pearl) - does colossal damage, increases the warp level (temporary) for the caster and the target, the damage depends on the warp level (the higher the warp level , the higher the damage), uses impetus

8) Battle swords
One of the cool things that Tainted Magic added, battle swords have their own unique enchantments, require both hands, allow you to deal double damage when you hold the right mouse button (during the preparation of double damage, works as a shield)

For now, this is the end, I will supplement this suggestion

Thaumic Wonders has a Flux Capacitor that holds flux like a Vis Battery holds vis. It can even be pushed around like a Vis Battery. Really useful for flushing flux out of nearby chunks and consolidating it into one place. And it has a system for draining the flux out of said capacitors as well, which does so less efficiently than the condenser lattice, but never malfunctions. It's a decent take on the matter.

Chaos - costs a lot, does big damage, gives random effects, explodes, requires all usual crystals, (if it is possible) lens shimmers with rainbow colors

Isn't that basically the primal focus. I think Codex thought about implementing it but it wasn't really viable with how the foci are implemented.

Yes, it is primal focus