It would rarely be effective to market yourself as a generalist on paper.
If you have 3 primary skill sets you should have 3 focused resumes.
If you want a position that requires a generalist, the only/best fit would be founder. In almost all other circumstances, companies hire for a problem and not general optimizations. Even if they need a generalist.
I would posit that you have a marketing problem and not a skills mismatch problem. The noise to signal ratio on your resume may be making it seem to not match any position.
If you have 3 primary skill sets you should have 3 focused resumes.
If you want a position that requires a generalist, the only/best fit would be founder. In almost all other circumstances, companies hire for a problem and not general optimizations. Even if they need a generalist.
I would posit that you have a marketing problem and not a skills mismatch problem. The noise to signal ratio on your resume may be making it seem to not match any position.