Not gonna lie, Extra Utilities 2 is the most OP mod I have ever found. In the early game, it gives you cheap item and wireless transport, good RF generation, wireless RF transfer, ore doubling, watering cans, and dirt cheap building blocks.
In the midgame, it gives you the ability to get a quarry, get lots of GP, get flight, get bags of holding, get a storage system using an indexer, ineffable glass and spikes for mobfarms, drums, autocrafting, mufflers, redstone clocks, mechanical users and miners, and so much more.
In the late game it gives rainbow generators, stacked enchants using the OP bow, axe, and sword, the ability to change biomes using machines, diamond spikes for player drops, compressed versions of blocks, golden lassos, and cursed earth.
This is one mod, and its not even a lot of JEI pages or super hard to understand.
Edit: I forgot to add renewable ender pearls, klein bottles, sun crystals, flat transfer nodes, magical wood, building wands, boomerangs, resturbed mob spawners, angel blocks, lux sabers, opinium cores, creative items, world interaction upgrades, etc.