Then either a) you DON'T have the timing/chops/reliability/referrals or b) you don't have the right referrals.
Getting into any band isn't like getting a job at McDonalds. You obviously have to be a great player, but there's this whole "people" thing that has to be happening too. You have to get to know alot of people, or let them get to know you, and maybe years later they'll take a chance and let you sit in. The more you're out playing the more people can see that you're doing stuff, and they can see you play.
And even if you're a really good player, remember those people skills? Touring bands are basically joined at the hip on a tour (sort of), and out the 100% of time you're together, I'd say maybe 10% of it is spent playing music on stage. If you can't get along with people, it's gonna be a long tour. Or if you can't tolerate others, same deal.
I worked at Disneyland in a few bands there and even though we got to go home every night, some days it's hard because you're dealing with alot of different personalities. And the more inexperienced of us were literally lashing out at other players before the gig was over. Those people never got called for the next job. I got to do it for 15 years, so maybe I'm more level-headed than I think. But during my time doing that, your playing level is the least of your concerns. The company assumes everyone can do what they ask of them (and we could). If you couldn't, you weren't asked back!
Sometimes bands are looking for a 'look' too. I'm too short for alot of things, so if you're looking for the lanky, tall, long-haired rocker, I'm not your guy. You have a country band but everyone has to be blond in a cowboy hat? Not gonna work with my black hair. If you need a shorter Hawaiian to play anything, give me a call!
And of course, none of this seems fair, and it isn't. You could have it all; talent, reliability, but man, if you show up all covered in tattoos for a wedding band audition, what do ya' do? Several pro musicians have written articles on how to a be busy sideman, and alot of those articles really stress being able to get along with people, and being able to dress the part, and showing up early, these points were almost more important than your actual playing. In fact, I started working alot in college not because I could play and read music, but because I could sing, and the band didn't want to hire a separate singer and a drummer, that was too much money. I became a double threat that day.
You just have to slug it out with the rest of us and see what doors open. And when that door does open, don't blow it. Luck is when preparation meets opportunity - Steve Jordan said that.
Anyway, that was my adventure. Your mileage may vary. There must be other words of advice for our OP from the vast amount of pros here....