HOW TO BE OP WITHOUT CHEATS

This isn't a story but actually ideas on how anyone could be overpowered in some fiction world, just incase any of you is lucky to reincarnate or transmigrate into another world. This can also be used as ideas for anyone who want to write a fanfic about weak to strong mcs. For majority of my ideas are incase you end up with no talent in ur reincarnation, so I got the most optimal power up method I could think of. Its not just Anime but also some cartoons and tv shoes as well.