Why i became so strong...?

This will be a story of our main protagonist named solar  on earth . He lives on earth..... currently... He is tired of living boring NPC life everyday and repeating same thing all day btw he is 17.his family is not rich and is very bored of everyday life . As soon as he turns 18 he died on earth but was summoned by God for a mistake God did ... Now what will it be .

The story will contain 3 parts

1st shortest will be earth life

2nd meeting with God also short time

3rd and entirety of Novel is why did he became this powerful

Now this ain't your normal powerfull protagonist anime come on man it will definitely be interesting as you see it or read it ...... For now.....hehe.

also for those who didnt like the cover sry but i cant do much