I've been playing minecraft a lot since 2013, I know the game and I know that playing minecraft with mods enhances the experience a lot. Actually I use the BetterMinecraft modpack. It works only with forge and its actually for the version 1.16.5.
You can try these: Extended Caves Dynamic Lights Minecraft Comes Alive BiblioCraft Chisel Pam's HarvestCraft Rope-Bridge Heres What Youre looking At Infernal Mobs Inventory Tweaks Iron Chests Biomes OPlenty LotsOMobs Just Enough Items JourneyMap