Did you have any hypomanic-like (overly active, led and leading (from the front), out of control, "perceptive" and irritable/sensitive, possibly with some euphoria, not necessarily all in equal or even perceptible amounts) symptoms/behaviour/feelings while not taking all those meds.

I'm honestly surprised you don't get very manic using all those drugs, unless you take high doses of Seroquel compared to the rest.

I would suggest you try to manage with just quetiapine/Seroquel and maybe one of those other meds. I'd try just amytriptyline. It has a broad profile, like quetiapine (but it doesn't do anything to reduce (the effects of) dopamine). It also grounds/directs you more than typical antidepressants, being a bit more like a psychostimulant.

If those two don't work maybe try quetiapine on its own and only if that doesn't work try another/one of your antidepressants.

If you have experienced hypomania without meds, a mood stabiliser is indeed a good idea, but try quetiapine first: it also stabilises you mood, it works as a mood stabiliser (too).