What do you think an accelerator is looking for in a start-up?

Hi everyone, I am working on a startup as its digital marketer, it's growing fast and we do have a business plan, business model, and everything. the thing is the start-up keeps rejected by accelerator all the time, and they say that your startup is not on our funding strategy. The start-up is simply about throwing any party easily with a couple of clicks. everything will be delivered and designed in no time.