The godly one human/god

it is about a man who grows up in a world where demons and monsters exist. in this the man is just a human but as he fights he gains memories from his past life as he does he gets powers that makes him op his name is Nick. after this experence he goes out to get stronger and in this world is a lvl system. and after 100 years he has not aged but then meets 3 people hew will soon become his friends after he saves them from a high level demon. they than form a group they ask what his level is and he says 70 to hide his real level they say they were rick level 50' pep level 41and lily level 38. rick and pep are sword users while lily is a mage. but what they don't know is that Nick can be any class. although there are 4 classes reaper uses syth' swordsman uses 1 sword maybe 2' knight uses sword shield and mage uses magic. Nicks total level is 9999 it isnt that max tho as after 50 years with these friends 1 is dead pep he died from a attack at his house after 80 years rick' lily after that Nick is mad he lost all his friends but soon he dies from a suicidal battle with a whole country. he on the other hand is happy he is then reincarnated as half human half god he is born in 1700 when he is 10 he gets back his memories again and starts to work hard to get to the highest level imaginable to where he can kill gods. but what he doesn't know is that a strong demon and god had come to earth and are working together staying low but eating humans slowly.