I studied to become a doctor, but became depressed due to loneliness. I had a good connection with islam in the past but for the last few years feel lost like I don’t know my purpose. I am on meds now and mood is better but I feel empty. Becoming a doctor was my goal and now don’t know what to do

Why don't you continue studying as a student of knowledge? This doesn't contradict the other. And if it is loneliness, why don't you seek out a pious Muslim wife so that you can start a family? You can also go to the masjids and get to know some of the Salafi students of knowledge brothers, and get rid of this problem.