These are the exact ones I have used to develop my skills as an illustrator, designer and business owner.
Elizabeth Olwen pattern design class on Skillshare
Cat Coq on Skillshare
Bonnie Christine on Skillshare
Liz Kohler Brown classes on her studio website (you have to become a studio member to access, but she can be found on Skillshare too.)
Use my Skillshare link to sign up for 1 free month of Premium so you can try out some of the fantastic classes yourself.
I’m also a huge fan of Domestika and their wide ranging, high spec classes. Also, the great thing is Domestika isn't subscription based. You can but the courses that interest you and work on them when you want. They have regular sales too, so it's worth checking out.
I've been working as an illustrator for almost a decade now but that doesn’t mean I can be complacent. There is always room to improve and try new skills. With the emergence of Procreate in the last few years I’ve found taking classes specifically on this subject to help me understand the software.
I've also learnt about pattern styles I was unfamiliar with, how to create videos for social media, and gained extra knowledge about art licensing.
Learning new skills seems to get more exciting as you get older. I’m not sure why that is, but ultimately it means I've still got plenty of years left to learn some great life skills and keep adding to skills base.
Comment below with your class/teacher recommendations so that other people can learn too.