Also putting in a vote for ClipStudio, keep an eye out for a sale it’s definately worth it. Best part is that it’s multi-platform
But until then, another option is Krita
https://krita.org/
Also multiplatform, and free. It’s a lot more powerful than it seems however the UI is still in development and takes a little development. It has a huge amount of features and tools for painting and illustration and definately worth the look.