I've dealt with this kind of depression before. You need to balance between "productive" sources of pleasure and generically fun, easy , meaningless sources of pleasure.

"Productive" pleasure doesn't mean you have to start a side hustle, just something more memorable and meaningful thank a quick hit of pleasure.

For me , the most minimal version was instead of playing randomly generated rougelikes, it was playing 3d games with a plot I had to pay attention to, or a film I had to pay attention to.

Obviously, the more involved and challenging the pleasurable activity is, the more you feel like you're growing yourself as a person. But to get the ball rolling you can try that. Then you can work on developing a skill, like painting, or music or something else. Maybe you want to learn a sport.

For me I worked up from playing Fallout: New Vegas, to playing the guitar more, to programming personal projects.

You can look this up more/talk about your therapist about : Eudaimonia and hedonism

https://en.wikipedia.org/wiki/Eudaimonia

I feel pretty fucking lost too. You will get through this.
Talk to friends and family if you can. Try therapy if that is an option.

Nothing is a magic pill but slowly working on it will help with time