First thing is going outside. Staying inside is only going to compound depression and cause days gone by to become a blur. Just doing that is a step in the right direction, bonus points if it involves moving the body.
Second, start writing. Writing can help prevent circular thoughts and force the brain to plan how to change your lifestyle and get you to a life worth living. If you don’t write, it’s very easy to repeat patterns over and over again.
Third, don’t lose hope. Having a positive outlook and a growth mindset is going to help you navigate setback and push through obstacles. It’s easy to resort to a fixed mindset, but the saints are the sinners who keep on trying as they say.
Best of luck!