I made a pack for a server, it has magic, a bit of tech and a bunch of origins, hundreds of new structures and a few quality of life improvement mods, feel free to try it, if all has worked out well then it should enhance your vanilla experience and be good for playing with friends. I can't guarantee it'll work as expected since I'm new to all this however. Have fun!
non-exhaustive list of mods and/or features:
Origins(lets you choose an 'origin' when you start, giving you different abilities to change up the base game.)
Just enough Items(I added most of the 'Just enough' mods that were compatible, they each add various things but are mainly quality of life.)
Extra structures(I added so many of these that there is no point trying to remember, let alone list, them.)
extra creatures(New animals, enemies and bosses, several mods contribute to a whole roster of new creatures.)
various magic mods including thaumcraft(I added them cos blood magic but then I saw more magic mods and got a bit carried away.)
tech, there is minimal tech mods as I still want that 'medieval fantasy' vibe that makes Minecraft special, but I added a few that I felt were in keeping with aforementioned vibe, mainly some 'steampunkesque' mods.)
not much more to be said, probably loads more mods I forgot about, but that's all the basic groups of them.