I easily understand what you mean, my experience here about rejection is worst than yours (70 rejects or more I don’t count anymore, it’s a waste of time ) 
And It still like this, but don’t loose faith, just work the best as you can, try to upload on, other market too. Approvals will come step by step. Actually it’s more harder to get approved. Think about all the great author who compose music during 5 / 10 years now. We can’t handle this in the near present, but on the long run, we will be able to get there too
And rejection doesn’t mean that your work never be sold. Most of my rejection here works well on other market !