While it isn’t on sale anymore, Solidworks for Makers is only $48/year.
You can also get a free/makers version of Fusion 360. Find it on Google.
There is also Freecad, OnShape, TinkerCAD, and more.
Since you’re not really invested in Adobe Illustrator do what several have already suggested and check out Inkscape.
You’re going to have to invest a bit of time to learn all of these, so check out some YouTube videos and see what gets you excited enough to want to learn.