This seems an irrational decision, as tech first companies also use c#, and you are ruling them out because of a general trend.
In any case, before I removed mention of C#/.NET on my profile and resume, I would be bombarded with recruiter e-mails and phone calls advertising jobs at old school cost center companies, most of them paying very poorly too.
After removing C#/.NET, these have gradually declined, and nowadays any recruiter that contacts me is for a job/company that I would generally be more interested in.
Pretty sure SpaceX and Tesla would pay competitively to most cost center companies too. Though I hear Elon works his employees hard.
As I said above, my decision is more about filtering out many of those companies that use .NET as their primary stack because I've found far more often than not, they aren't the best companies to work for as a SWE.