I switched to Gravit Designer from Adobe Illustrator, and it's been fantastic ever since. Gravit offers a 100% free design platform that works on macOS, Windows, Linux, online, and on Chrome OS. Support for mobile devices is coming soon!
Once you think that you have the skills (and work to back them up) as a graphic designer, try getting a professional designer on Dribbble to invite you to the platform. (I've got an invite: message me on Twitter)