Honestly if you want best free cad program there is nothing close to FreeCAD, sure UI isn’t super modern but as someone who had to use CATIA in high school it looks amazing, just slap dark theme on it so it doesn’t hurt your eyes. If you are up for paid version there is BrisCAD but price is spicy, not sure if it is possible to find pirated version for linux or if you are even interested in fucking with that.