I've been in poly relationships before that didn't end up well, perhaps because of my age at the time or because the person I was with who was also dating other people was quite toxic. And then I had another experience with an open relationship (only one committed romantic partnership but we were allowed to have sexual/non-committal experiences with other people) which was, honestly, a far more positive experience.

Right now actually since I'm fresh out of a relationship I've been thinking again about how I experience romance which has included some thoughts about how I experience monogamy. I have never cheated on anyone, but I can't lie and say that a big part of the relief from leaving relationships is always "God, now I can flirt with other people again" or "Thank god I'm not limited to only having sex with that one person forever anymore". I think I have some resentment about committing sexually to just one person forever, but on the other hand I like the idea of having that one emotional/romantic partner who I can always go back to.

Right now regarding polyamory I'm not sure, but I do think that I would want to seek out an open relationship again, but also that it probably(?) won't be a dealbreaker if the person wants complete monogamy, if I really really like them and we are really compatible in every other way.

Another thing is that my sexual needs are just very diverse; as a switch I am deeply attractive to both submission and dominance and it's just really hard to find one person who can be both of those things for me.

I also liked sub sharing, that was something I did before when I was in an open relationship with another dom. BDSM polyamory (in its many forms) is probably the most attractive kind of poly/open style relationship to me.