* Sunlight. Get outside. I have seasonal affective disorder on top of major depression, and if I don't get enough light, the suicidal ideation comes back. I have a lightbox but its not as good as the real thing.
* Exercise. I know. This one sucks. This might not be possible until the meds bring you back up to a baseline-functional. Try to get a walking buddy, and just take a short walk once a day. Walk outside to get extra sunlight as a bonus. You don't have to do a major workout, even just a 15 minute walk is better than nothing. Try to get a friend to walk with you. Not only does having someone to talk to make the walk go quicker, but it also gives you someone you have to be accountable to about walking. Or if you can't get a walking buddy, find a favorite podcast or something that you only listen to on walks. Make it something to look forward to.
* See a doctor and take care of anything else that's also going on. Get your thyroid checked. Get your blood sugar checked. Hypothyroidism or diabetes will make depression worse.
* Good sleep is vital. Maybe ask your doctor about a sleep study too, if you snore. You might have sleep apnea, and not getting good sleep will make your depression worse.
* Try to eat better. This one is hard too, and like exercise, might not be possible right away. "Better" is pretty subjective and nutrition is a volatile subject, so I'm not going advise a specific diet, but if you're eating pizza and fast food every day because you don't have the energy to cook, changing that will help.