Look at QCad. They have a paid ($40), and a free version that is fully functional and open source. It's the most autocad-like app out there, so learning that has the advantage of learning the UI of autocad too.
LibreCad that others suggested was forked from Qcad about 15 years ago and hasn't moved much in terms of features. While QCad has. So in my opinion, it's the best solution.
Then there's Freecad, but that's more about 3D cad, and it's more complicated overall.
The reality is, to get these Windows VSTs to work on Linux, is possible via 2-3 ways, but they're crashy, and sometimes will work, and after an OS upgrade might stop working (as it happened last year with yabridge under ubuntu) etc. The truth is, you can't rely 100% on these VSTs anymore under Linux, it's too hairy of a situation overtime. You might be able to get it working for a project, and two years later to try to reload that project, only to have these plugins not working anymore, so the project would crash on you and not be able to load it anymore.
If you want to switch to Linux, you will need to use the well supported, native plugins only that get updated regularly for new linux versions. Yes, it's a waste of money for your existing purchases, but this is what's true for everyone who have ever bought Windows software in the past, and they're now switching to Linux. Maybe you can sell them?
Alternatively, use Windows for your audio work, and if you want to stay on Windows 10, make sure that this computer is not on the internet connected anymore (due to not receive security updates anymore), and use Linux for your everyday computer tasks.