The only thing I can think of is to create a favorites list of fonts that are system fonts and then when you use a font, always make sure you are using that filter when selecting a font. Maybe someone has a better answer.
p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.
Thanks for reaching out. I hope the suggestions shared by michelew83603738 helped resolve the problem. If not, would you mind trying to disable the Adobe Fonts service from the Adobe Creative Cloud Desktop application preferences under (Menu > File > Preferences > Services) and then relaunching Illustrator to check if it helps?