Growth consumes resources.
Whenever an opportunity arises, you have to make an honest assessment not just of the benefits, but of the costs to following through.
Although money is the first thing that comes to mind when we talk about affordability, that's not all we have to consider. Credibility, motivation, man-hours, and even sanity are all limiting factors to growing your band.
Even if you do have the funds and credibility to play a festival show on short notice, would your drummer have to cancel her first vacation in six years?
Burnout is a very real issue, especially for a DIY band that can't offload extra work to a management team. Pushing people beyond their burnout threshhold is dangerous. Push too much and you risk losing band members's effort or, even worse, band members. (Made this mistake.)
Remember how hard it was to find and audition new members of your band? There's a limited supply of musicians who would be a good fit for your band, so constantly churning through members is rarely in your best interest.
As you begin to grow your music career, more and more opportunites will begin to innundate you.
Not every opportunity is a good one; 50 fans in a 50 capacity room is better than 75 fans in a 150 capacity room.
Are you pursuing good growth or bad growth?