Long-term, finding a therapist you trust and whose style works for you will do more to improve your mental health & ability to deal with stress than anything else, so long as you're committed to the process and doing your homework between sessions. I went to therapy because other people told me to a few times, and that never helped, but as soon as I decided I needed some help on my own, it started me down a path that has made me a much more resilient person.
But that's a long process! So for the short term, adding in mindfulness around time management. Scheduling in your self-care and leisure time makes it feel a lot more intentional and restorative. What I mean by that is, if you're a student and have a big paper due, you may find yourself doing leisure activities as a form of procrastination, which will just stress you out more. There's a big functional difference between scrolling social media for an hour when you "should be" researching vs. having 60 minutes set aside on your calendar for a face mask and an episode of your favorite show.
I spend a lot of time in the gym, but until recently, nutrition has been a huge question mark for me because I don't like cooking and just feel overwhelmed and exhausted by the idea of having to feed myself. Then I discovered minimal-cooking meal prep, which has changed my life. If you're in a situation where you have to prepare your own meals, I'd recommend trying it out. Start small by just making lunches or dinners for the week. On Sundays, I set aside 2-3 hours and get breakfast, lunch, dinner, and snack ready for the entire week so I don't have to spend ANY time worrying about food until Saturday. I hadn't realized what a stressor that was for me until I got out ahead of it.
Journaling is good, as is just letting yourself have a nice cry in the shower. The main thing, though, is being kind to yourself. If you have a habit of negative self-talk, replace all of that with love and encouragement so that "Why am I so lazy?" becomes "We've got a lot going on right now, but let's get a little work done on this project," etc. Just try to be on your own team.