Affinity Designer is a pretty good tool for vector drawings (for 55$ unique payment). It fills the gap between Inkscape and Illustrator.
I took the trial after seeing people suggest it as an alternative, but it didn't quite replace my workflow and I ended up dropping it.
Unfortunately there is no Linux version otherwise I'd happily buy it.
I'm on MacOS where current versions of Inkscape are not really usable because of (understandable) performance degradations. I wish that either those problems could be solved, or that an alternative existed which used an open file format.
I'd prefer a pure FOSS solution, but as I'm a BSD-school FOSS person I wouldn't mind a proprietary app so long as that proprietary app used an open file format. It sucks that Affinity uses a proprietary format which is at high risk for orphaning or degradation either if they decide it's in their business interests or if the company ceases to exist.