I feel insanely at peace (no suicidal ideation so far doing this) when I'm hiking. I live within an hour of like 4 national parks, even more if i'm willing to drive farther than an hour. My favorite is about 40 minutes away, and I went there a few weeks ago and it was great. I went with a friend and we hiking the trail, went to the overlook of a huge waterfall, and a little area that views the waterfall. Additionally, we went to the river banks right next to the waterfall. sat for 5-10 mins, listened to the water, talked, and finally got back up, started the ascent to the top and finished the hike. It took about an hour and I thoroughly enjoyed it. I'm hoping to go camping some time and see if the suicidal ideation stays away for the whole night. If so, camping trips could be a sort of self-medication when I have the time. I just don't have the time or resources currently, but the university I'm transferring to allows you to rent equipment so I might rent various camping equipment and use it over a break such as spring break or possibly fall break, and try camping for the first time at a natural park.
EDIT: Just learned my future uni has a sort of club that hosts these things and over fall break, they host a 4 day backpacking camping trip. They provide things like transportation, permits and reservations, group camping gear (stoves, tents…), dinner breakfast and lunch, etc. All I'd have to bring it appropriate clothing for the weather, which they provide a list of, same with personal outdoor gear, lists are provided, snacks, and your phone/camera to take photos. If they'll allow me, I might even try to bring a friend, though they aren't a student so I don't know if I could. They charge $80 which seems fair for what's provided
Sorry, I just realized this is a huge tangent but nature and hiking, look into it. If you're a student, you might have similar access to resources such as this. If not, maybe you can find some sort of clubs or groups that do this kind of thing as well.