Why don't you try contacting the people that are still updating modpacks for 1.8 on curseforge?
https://www.curseforge.com/minecraft/search?page=1&class=modpacks&gameVersion=1.8&sortType=3&pageSize=20
Looking at that list, the latest update that actually was for 1.8 was September last year.
So I wouldn't hold out much hope in finding an active community for that version.
Maybe try 1.7 which still has the GTNH modpack developers updating and fixing mods? Or 1.12 has a similar group.