@DrSuzanne So for a free vector illustration software outside of Adobe Illustrator, you really only have Inkscape https://inkscape.org/
Affinity Designer https://affinity.serif.com/en-us/designer/ is another great alternative but it's not free (but It's not subscription based so only pay once for all features)
Hope that helps. Let me know if you have any other questions.
@sand good question. I want to design my own characters, which I do in another app, to add to text to and then make t-shirts. Canva was great for the last two parts, but I dislike their business practices.