Until you're through with bronchitis, you should rest and focus on getting better. After that, I suggest reevaluating whether you're still into running and HIIT. Those are great exercises but you sound bored with them. Plus they're really hard on the joints, and as you get older, you might want to switch to lower impact exercise anyway.

Dealing with depression is tough because it's a huge demotivator and even the smallest things can seem daunting. It might be worth talking to your doctor about the depression, and getting your bloodwork checked because sometimes nutrient deficiencies can be a contributing factor. But with your current mindset, it seems like just getting up and moving around would be a good start for you. So while your shoulder heals (and I agree with the other poster, are you going to physical therapy?), you can work on cardio with walking. Maybe find somewhere out in nature to go for a walk, and don't focus on it as exercise, think of it as medicine for your mind and body.

As for rebuilding muscle tone, have you considered starting weightlifting? If you're already thin, you'll start to see your gains pretty quickly, which is a good motivator to keep going!

Good luck to you 🤜🏻

Also your English is pretty good, but just FYI most people only use "flaccid" to refer to a limp penis. :)