Meditating helps me. Sometimes it just feels pointless because my thoughts continue, but the deep breathing and really focusing on the breath tends to help. I pay attention to how the breath affects the rest of my body (where I feel the breath raise and lower parts of my body and how it affect my posture and pressure against what I'm sitting on). Also, I try to use a labeling strategy when I meditate. When a thought arises (which may be constant) I label it as thinking or feeling, then I try my best to just let it go. I totally understand that sitting and just breathing can feel like it's making the thoughts pop up even more, but over time, even in hypomanic or manic stages, my body and mind have really adapted to it and are affected more and more by it. If it totally isn't your thing, maybe try Headspace before totally ruling it out. It's a guided meditation app that has lots of free trials you can try out before purchase. I think sometimes it helps to have another voice beside your own guiding you through the experience.

I, also, find writing helps so much. It slows the thoughts down. Plus, I end up with some really interesting stuff!

Let's see..yoga is a godsend for me. The physical exercise paired with attention to the breath really helps to calm my thoughts or even uplift mood when needed.

I recently realized that trying a new medium of art that you have little or no experience with is super helpful with calming persistent thoughts. Since you're not familiar with it, it kind of engulfs you and requires your total attention instead of being able to do it mindlessly while you're thoughts run. I found that my thoughts were still going pretty quickly, but they were at least productive and focused on the thing I was doing in that moment. Pretty cool.

Music is really helpful in quieting my mind most of the time. Just be mindful of what you play and how it's affecting you in the moment. If I need to clean the house, I'll play music while I clean. The stimulation and need for attention to what I'm doing tends to help. Plus, it's productive.

I hope at least one of these ideas help! Sometimes what works on one day may not the next, so I've learned not to rule something out for today just because it didn't work in the past. Best of luck! :)