Reviewers’ comments are not sufficient to reject my paper, what to do?
You make the suggested changes, assuming you agree with them, and submit to another slightly less prestigious journal.
Most likely, the editors didn't think your paper was interesting enough for their journal, and the reviewers weren't sufficiently enthusiastic about the paper to convince them otherwise.
At the top journals, for a paper to be accepted, it's not enough for reviewers to recommend acceptance; if the reviewers don't explain in convincing and gushing detail about why the paper is the best thing since sliced bread, it's not likely to be accepted.  (Of course there are the few exceptional cases where it's obvious that the paper is the best thing since sliced bread and there is no need to gush about it.)