I like lemmy but reddit is still difficult to replace due to lack of content and active communities. But I ain't using the official app so I guess here we are.
The thing is I use reddit mostly for fun stuff. I took out a lot of the political stuff that was getting me down. There's not nearly as many niche cute cat subs or active hobbyist game subs on lemmy.
I still use reddit when I'm looking for very specific information, because reddit still is an amazing database of content/info. Many of my searches kinda end up on reddit that way. But I don't post there anymore and I block all ads. So... I'm still using it but providing nothing in return. I can live with that.
It's different for everyone, but for me it was just doom scrolling and not so much engaging with specific communites, so actually there really wasn't a need to replace anything. I just don't do it anymore and have more time for my hobbies now.