I'm sure that Onshape may be good - BUT, OP says he's looking for 2D CAD. Sometimes that is more than enough.
?
I'm still using my copy of AutoSketch 9.0 which I purchased somewhere back in 2007 or so. And that was based on
QuickCAD which AutoDesk purchased and repackaged. It's a very good program because it does the most important
thing - It let's you do what you want and otherwise, stays out of your way. 3D is great, IF you need it!
--
Jim Korman