This is why Lemmy needs to keep tweaking it's feed algorithm. I understand why many people rightly have a distaste of social media algorithm fuckery, but Lemmy doesn't have some of the same bad incentives that an ad driven site like Reddit or twitter might have. A better algorithm will help Lemmy grow and surface interesting posts organically.
The recent feed change to boost smaller communities in 0.19 is a good start, and not showing too many posts in a row from the same community will be another welcome change.