I have a similar experience, but its like a user base of 200k vs idk how many million on reddit. There wont be an infinite amount of posts until lemmy grows more.
I think only 1 percent of all users on lemmy and reddit post. So its 2k active posters vs 60k active reddit posters (assuming reddit has 6m).
The sorting has been bad i also see dead posts but overall im enjoying lemmy more than i had reddit in the later years (joined 2010).