I can suggest wiby.me 's random button to discover new sites with modern opinions.
disclaimer: I run lemmy.pt and use the platform on a daily basis
On mobile you seem to need to do old.reddit.com every time.
Never installed the app on mobile.
Although other changes might have made things better, like changing how default subreddits work (although this applies to new and old reddit).
With the exception of a few subreddits that have made explicit rule changes (either encouraging or discouraging memes), I haven't really noticed a significant long term trend in meme-posting within subreddits.
And even then, browsing /r/popular is just awful. Elimination games. People blatantly asking for personal information from teenagers. "Tell me your favorite X and we will judge you" Dumb NSFW 'questions'. Repost bots for content from years ago. Misinformative titles. "Unpopular opinion" threads.
It's a mountain of trash to wade through to get any decent content.
Watching many of those short anger-inducting videos can make even a calm person change. The sort of stuff Reddit PMs have signed off on in the name of engagement is despicable.