I'd also vouch for Krita. While I'm not a fan of it's window or layering system I think it has a nice balance of features compared to other digital painting software like Paint Tool Sai, Fire Alpaca, Corel, or Photoshop. I made the (mostly) full transition to it earlier last year and don't regret it.
The amount of support and updates Blender gets makes me extremely happy/confident in the amount of time I've spent with it over the years. New functionality tends to work really well with already implemented stuff and allows for a lot of cool experimentation.
In that regard I'm really looking forward to messing with the geometry node stuff. Based on videos done with beta version it seems like there is a gigantic amount of potential there.