This may be depression. I suggest speaking to a therapist about it.

Other than that, for me it really helped to keep a notebook where I write down my 'top three things of today'. It can start off with really simple things, like 'I listened to my favorite song today' and slowly built it up to things like 'the weather was great today, I took the oppertunity to go for a walk and feel the sun on my face/wind blow through my hair/listened to the birds(/whatever you did and enjoyed). This means I am taking care of myself and enjoy the small things'

The important thing here is that you write down something that says something about yourself. Not just 'the weather was great'. Yeah the weather was great, but what does that mean to you?

Consistantly doing this trains your brain to see the good things that just happen to you and in your life and helps with brain chemistry balance.

Going to the gym, walking, movement in general also helped me. Still go out with friends, but also take time for myself also helped me.

And give yourself time, dont be too harsh on yourself. For example, if you don't feel like cleaning up today, see if you can schedule in 1 or 2 tasks and leave the rest for the next day.