A lot of country- or city-specific subreddits either aren’t on here or are quite inactive. To be honest they were mostly cesspits on Reddit so maybe it’s no bad thing but you occasionally found useful information there.
Other than that, there were a few subreddits that were good for recipe ideas, like /r/EatCheapAndHealthy. /r/ZeroWaste was good too, on occasion.
In general, non-tech related communities don’t seem to have migrated over as much. Most of the subreddits I followed were related to technology in some way and now have pretty active communities on Lemmy.
I miss having large and active subreddits for the sports teams I follow. They were my primary source of news for the teams and game day threads were great.
There is a cycling community that copies the reddit posts, but theres too few people to discuss anything with…