[krenel]

Your comment resonates with me.

I work hard to improve things; most of it was worth it, some of it didn't went well but it was a constant fight with my boss. If I failed, he would bring it back for months.

What worked for me was to step back and get into super pasive mode. Give all the responsability to my manager. I didn't question any of his design decisions, gave support to all ideas even if seem plain wrong unless he wanted honest feedback (usually, he didn't because I would change the original idea). Never say or even insinuate "I told you this was not gonna work"; I just acted surprised and asking to him "ok, what do we do now?". It just took a few months for my manager to start reliying on me, more and more. Now I have even more space for improving things, with the full support of my manager because "he wants me to do it" not "because I push my ideas to him".

At the end of the day, it's not dumb if it works.