I think you're wasting a lot of time and effort. I've been getting jobs for nearly 40 years, and have never networked, never worn an expensive suit, and invested in "prep" once, which was an email exchange. Send resumes. Fill out applications.

If you come from a regional as a captain, was that your only job? Very narrow experience field behind you? Look ahead to a narrow field of jobs; airline, primarily. Sounds like thats your target; there are a lot of jobs, but you're into a slowdown in the hiring for the moment (that time of year), and a massive training backlog across the board with a lot of operators. You're also a dime-a-dozen, so it may not be that you're doing something wrong, but there are a LOT of cookie-cutter you's out there applying to the same jobs.

If you've had two rejections and one no-hear-back (you mentioned Omni in another thread, and it's only been a month, I believe)...you have everyone else to apply to yet. Do that.

You're just scratching the surface on the effort scale. Spend less time trying to get someone else to get you a job, doing video practice interviews, and buying expensive suits, and just apply. Then go interview. Done.