I think in Sevens MC is kinda pretty decent/strong in the beginning. It's just that his sister is a monster.
Weak to Strong tag https://www.novelupdates.com/series-finder/?sf=1&tgi=71&mtgi=or&sort=abc&order=asc might help?
MCs often start as non-cultivators or even worse, cripples who can't cultivate. Others reincarnate and start off as babies. On the other hand, non-cultivators can also be a minority in many novels.