Browsing Lemmy’s front page has replaced reddit’s r/all for me, usually checking top of 12 hours from all instances.
But I still use reddit for specific forums of certain things, because it’s just the biggest community for the particular subject. I usually try to check if I can find the particular subject from Lemmy and check that out first though.
I’m more of a commenter/lurker and I quite rarely make new posts, but when I do make one:
If it’s a question about something I need help with, I’ll start with a Lemmy post and then possibly also make one on Reddit - more readers, more answers.
If it’s just a shitpost/meme/“content”, I only post it on Lemmy.