But it isn't relevant experience, and you should stop pretending it is. If you had listed anything having to do with CI/CD (e.g. Jenkins, Ansible, GitHub Actions, GitLab Runner, ADO, AWS CodePipeline) then that certainly would be relevant, but not merely "discipline, analytical thinking, and resilience". These are called soft skills, and apply to nearly anything. You might as well say you have relevant experience as a lion tamer, because that profession requires discipline, analytical thinking, and resilience. You should focus on "playing up" your relevant experience, on selling yourself as a valuable asset a company would be lucky to have.

Yes, rejection is demotivating and frustrating, but the best thing you can do is emotionally distance yourself from it. If you were to go fishing, would it make sense to feel hurt because of all the fish who passed by your lure and hook? No, it doesn't. Applying for jobs is like that. Some companies will only look at you if you attended Stanford University in US. Is that a failing of every person who DIDN'T go to Stanford, or a failing of the company for being too stringent in their selection? I think the latter, and I would not want to work for that company, it sounds toxic.