How to get out of feeling depressed without medication?

I’m aware this may be a fairly common topic on here but for far too long now I have been unhappy for various reasons. I have been alone for some time and my last relationship ended badly putting me off anything else. I have good friends and a job but these things only seem to present temporary solutions to how I feel overall. I know that there are various medicinal ways to feel better about life or whatever but it is not an option as far as I am concerned, I want to be able to get myself out of this rut.
I haven’t told my friends how I am feeling because I don’t want to bore them and become the person who is always talking about feeling miserable all the time.
For any of yu who are or have been through the same feelings; how did you get out of it?