Firstly, to pick up on what Al said earlier, it doesn't appear that you have been "giving it your all" for 10 years. You've been doing floor spots in a few fairly local clubs - that's not giving your all. So to suggest that gives any indication of whether you're good enough to make it is misleading.

If you're not used to doing longer sets why not ask one of the clubs you regularly play at if they'll give you a longer spot?

From my own observation, it's often not the most technically proficient singers or musicians who make it, it's the ones who can entertain an audience (by which I mean hold an audience's attention), who are able to network, and who are prepared to pursue every opportunity, no matter how unlikely or unpromising it appears.