Hmm... I'm surprised Latuda isn't helping with your depression since it seems to help a lot of people (although admittedly, it didn't help me either, so you're not the only one)...

I am on Rexulti and it is used for treating psychosis and MDD. I have found it immensely helpful with depression. So, that could be an option for you if you're willing to give a different antipsychotic a shot. You know, focus on APs that treat depression.

Some people with BP have been depressed for years, so I guess you can technically be depressed for a while. HOWEVER(!), some people have a lot of luck with Mirapex. I just can't guarantee you won't become manic on it because I don't know much about it, but it is not an AD or an AP, so you could read up on that.

If you have changed your Seroquel dose around September, it is possible seroquel is making you depressed. I know I became heavily depressed on seroquel when my dose was too high for my body to handle. Plus, benzos like klonopin are documented to cause depression in a decent chunk of people who take them long term, so I don't know if klonopin is making you depressed, but it's one of those things that can happen and might take months or even years before it causes depression, kinda like TD.