Tate no Yuusha no Nariagari, Tensei shitara Slime Datta Ken Recommendations
Both series have a similar start and both remember more the way to play an MMORPG game where the character has to evolve to be stronger when uses abilities and arms. The protagonists are misunderstood!
both have the same story plot where guy finds himself in another world and both involved having to start from scratch in order to be somebody and to be powerful, however in Tensei, the guy is a 30 year old man who died and was reborn as a single cell organism, while in Tate, the guy is a coll student wh started as a low level hero who become a zero and now has turned into an anti hero.
The MC is summoned to another world where he is the weakest and grows stronger by absorbing powers off other things.