an injured old man

Morning, until 4 months ago I used to train at least three times a week. Running (9 km) and HITT. I'm 50, and I began to feel a lack of motivation toward both running and training. Then I've injured my shoulder, there's an hole on my tendon, thus I should use the elastic fitness band, but I don't. I became ~~flaccid ~~and I don't like my body, I'm still skinny, but I've lost all my muscles, I have to start from zero again (sore muscles, lactic acidosis and all that). And here comes the reason why I am posting here. I need a sponosr or someone who gives me some motivation and advice to begain all over again. Right now I feel sadly at ease (depressed but I don't kind of care, but I care at the same time, difficult to explain) with my body loosing shape, strength and agility. I also note that in the last month I've catched on of the most virulent bronchitis ever; I tend to think this is one of the fallout of my interrupting physical activity.Does someone want to help and old man with advice and motivation?(I'm Italian, thus forgive me English)