The mayor mods are vampirism and MCA. But there are also lots of other smaller to medium-sized mods to spice up your playthrough, you want to create your own tools no problem we got tinkers construct, you think that Minecraft's world generation gets boring oh boy we got a ton of mods for that, from recurrent complex to quark to chocolate quest or roguelike dungeons, Worley's caves and much more. You want to explore dimensions, no problem go to the twilight forest, or enter a dimensional door. OR maybe you just want to build your own base that can fly, drive on water or dive underwater no problem DaVinci's vessels got you covered or maybe you just want to ride into the sunset with your Chocobo, but watch for natural disasters, this mod pack also has tons of QoL improvements like backpacks, gravestone that keep your items safe after dying, a world map, a hud, JEI, JER, and dynamic surroundings and so much more, but I won´t spoil everything, so just download the mod and find it out for yourself!
And just a little tip I would keep my eys on these weird angle statues, I think they move when you are not looking.

