I have a similar experience, only visiting reddit for stuff like tech problems and very niche communities. I had never willingly visited the reddit homepage since.
There are a lot of posts now on lemmy compared to before the reddit fiasco but is not like the activity on reddit. The good thing though is that it made me stop my habit of mindlessly scrolling through endless content.
I did not dropped reddit completely, occasionally going in there through google searches but ever since the api fiasco I’ve never visited the site directly. I still haven’t deleted my account but didn’t used it since then and is planning to delete it. Lemmy does not have a lot of content and the niche communities compared to reddit. That is not a bad thing though and instead it had stopped me from mindless scrolling I picked up from using reddit.
Libretube would have replaced the youtube app for me if not for how slow their instances are for me. So far I did not see any crashes but the pages would sometimes not load and would require you to change instances. I think the cause may have been that the instances are hosted far away from me geographically and that my current internet connection has been having issues for non-mainstream websites.