I've been working in Unity lately, which is starting to click, although there's a huge amount I don't know. I'm still working on my RPG idea, and have some basic character creation screens up and running - and saving correctly to SQLite, so there are a few tiny milestones being hit here and there.
As an aside, my Macbook is coming up for seven years old, and it's still going strong. The only thing I've changed with it, is an upgrade to 4GB RAM a couple of years ago. It's running whatever the latest macOS is (I miss the cat version numbering, mountains are rubbish) without problem. Xcode does take an age to get going though, so I may have to look at a new machine this year.
The Unity work has made me think about porting my iOS apps to Unity, which would enable some different platform versions (Windows Store, Android for instance). That could be an interesting challenge. I'll have to see how it goes.