Just like the title stated. No harem. Mc is Male. The plot must not slow pace like World cultivation. That novel is super good, however i almost dropped it in early volumes since it was slow and boring. I want mc got friends that will stand with him until the end. Not rubbish side character where once appeared, it disappear forever, forgotten. I like good balance like, Doulou Dalu series. Mc is not super op in beginning. I want thrilled!
Forty milleniums of cultivation. Futuristic in cultivation world. Enemies are destroyed easily. Some epic moments of sacrifice that made me tear up/cry. Really awesome mechanical moments from crafter MC without forgetting MC destroying all expectations everytime. Romantic subplot (with the really strong looking girl/woman that believed in MC when after becoming popular he suddenly became declared a waste (but only him know that is not true / only temporary) ) but don't expect a lot from that.
Swallowed Star? It’s not as good as Forty Millenniums of Cultivation but it fits your description. Although the MC is very OP for his level, he always has to fight beings 1 or 2 levels above him so... Guess he isn’t that OP in the grand scheme of things.