I would give my friends Superpowers and start the origin of Superpowers in My hero Academia I have thought of more to add to my answer
Make the 6 infinity stones trap T-Series, Roblox, Ricegum, Suggsverse, Both Paul Brothers, Onison and Flakeleey in the soul stone then send them to infect some other universe like the parasites they are, oh and also make Minecraft the most popular game of all time and make it stay that way FOREVER
I thought of More
Bring Stan Lee Back to Life and Make him and The Queen of England Omnipotent
I’d also make new Galaxy’s and give the lowly humans of this galaxy Spectacular space travel technology to reach those Galaxies and in those Galaxies would be Alien Species from all my favourite franchises such as Marvel, Ben 10, Dragon Ball, Kirby, Mario, Sonic, Legend of Zelda, Metroid, (just imagine People from Nintendo “OH S**T ALL THESE SPECIES WE CREATED ARE REAL!”) Oh and there would be one galaxy with just Pokémon in it, Doctor Who,Star Wars, DC, Star Trek, Digimon, Skylanders, Yu-Gi-Oh, Magic the Gathering, Keyforge, and oh so much more this universe would probably become the most vast in the multiverse OH AND ONE GALAXY WITH JUST PAC-MAN AND GHOSTS!