Finally you can build your Alchemist world or do whatever you want.
With Reactive Alchemy Mod you can discovered items. And you can build mechanical builds, factories, auto farm with Create Mod.
Thanks to Alex's Mobs and Caves Mods there are tons of places biomes and entities waiting to be discovered here for you. I also wanted to have some small and sweet additions for vanilla and I added Supplementaries and Quark Mods for you, of course they are not the only ones, there are many mods that are simple and improve the game experience.
with Yung's Structures Mods you can discover improved vanilla structures so better strongholds, fortress, temples and more, and this mods compatible with other mods
And of course after all this effort it is inevitable that you will be hungry but vanilla's meals are too boring to rest that's why you have the Farmers Delight mode and of course you can cook finger-licking good recipes with many addons that add delicious additions to it
Also, don't forget that there will be many challenging creatures and adventures waiting for you, so to make your job easier, you will be able to fight much better with the Better Combat Mod and Spartan Weaponry Mod make yourself stronger with the Relics and Artifacts Mods.
Don't get too hung up on the name, you don't have to be an alchemist, be whatever you want.