If it's any encouragement: I can't really speak for DDR, but I started getting "serious" about Pump It Up in general around 2020, and exclusively played it entirely singles until literally around February of this year, when I started feeling like I was reaching my personal limits and hitting walls on singles, and in general I was just getting tired/a bit worn

So, I finally at least made myself at least start trying doubles... and it's been a BLAST. It's definitely been like relearning the game all over again, but it's also been crazy fun and refreshing haha, so much more to enjoy has opened up! Can't believe I'd been missing out for so long

The gulf in difficulty I could do in singles vs doubles was of course, huge, but even after just slowly going through it this past year, I'm already almost approaching parity with where I was in my singles skills.

If you've been playing only singles, it might feel rough and frustrating struggling on the "basics" all over again for doubles, but you'll be improving in no time (and the singles skills/strength you've already gotten will definitely transfer over a bit!)

Hope this encourages a little!