This is definitely an exaggeration based on your experience, and you said in other threads you chose not to apply to Republic, PSA, and Allegiant. That's like me saying the majors aren't hiring because the two I applied to aren't calling me for an interview. Many of them are hiring, they just aren't hiring me. Envoy and SkyWest are definitely hiring street FO's, I am not sure who else. All you can do is apply to everyone and keep improving your resume.

Pilot hiring is subjective, you don't always know everything they are considering when they decide who to interview. A couple years ago the regional airlines were interviewing pilots before they met their minimums and the joke was that all you had to do was fog a mirror. Those days are gone. Technically you can start training with less than the minimum, but that isn't competitive anymore. As more pilots enter the hiring pool, the airlines have more to choose from, and many are waiting months after reaching minimums to get a call. Not all pilots are created equal either, it's about a lot more than just your flight hours. An airline could weed out pilots based on anything they choose from failures to the grammar on your application to the way you earned your hours to who they think will stay the longest. All the FOs I have flown with at my regional built their hours flight instructing--although a few had hours from another regional--so I would conjecture they prefer that type of candidate. This may not be true everywhere though. All you can do is keep updating your applications and keep improving your resume and hire an application review service. I have.