@matt @June Hi, I'm using Krita for https://www.peppercarrot.com/ and Inkscape. Both are multi-platform and Free/Libre and Open-Source (they are run by non-profit org, based on donation and code is open to volunteer).
I also share my Linux install receipe here: https://www.davidrevoy.com/article783/kubuntu-linux-20-04-for-a-digital-painting-workstation-reasons-and-install-guide
Good luck −I was a Photoshop teacher 10years ago− and switching to another tool often mean doing many compromises. I hope you'll find features attractive enough on alternatives to ease adaptation and make it fun.
A way to access the Fediverse, for attendees of Penguicon, an annual convention of science fiction, open source software, and all geeky interests, in Southfield, Michigan, USA.
Convention info: https://penguicon.org