The Ro dropped

This is going to be my first fan fic. The main character Jack Saber after dying at an early age of 18 will get another chance at life when he is reincarnated by a God of unknown with a system and some wishes to live his newly found life to his hearts content. P.S the worlds the MC goes to range from worlds like Danmachi and Fairytail to Pokémon. This being the case because I want to make it like that however I might just make separate fan fics like a series from world to world. But we will see how it goes.