I would pay for you to back date to 1.12.2 honestly. I have a modpack I made for my server, and some of my user are on me to upgrade and get create, which I understand but I spent months putting the modpack together with over 288 mods. that took a lot of config work to make work without problems. So I'm just simply asking for a version to 1.12.2. I'm willing to help if you need. im not super experienced but I can try. I just don't want to have to start another modpack when I just did it and it hasn't been a year yet. thank you for consideration.

most likely not gonna happen, they're working on updating the mod to newer versions.
imo backporting mods encourages people not moving on from older versions, 1.16.5 has a decent mod selection, like 1.12.2 and 1.7.10, it's not that hard to create a modpack, except if you have a ton of customizations (quests, recipes...).

https://github.com/Creators-of-Create/Create/wiki/dev.status#minecraft-112-17-and-below
Provides some details from the development team as to why that will not happen.