Feeling bleak about the future of my relationship

How do you maintain a relationship with someone who has zero common interests?

My partner and I have been together for 18 months and I love him so much. He’s the most supportive, kindest person I know. He’s my best friend and I’ve never been closer to anyone person. However, we don’t have any common interests. This issue is starting to make me feel very bleak about our future together.

When we hang out, one of us usually has to compromise and do something they don’t enjoy just for the sake of spending time together. I can feel that this issue is really starting to affect my mental health. In the last week, I’ve had to have my antidepressant dose be increased. I don’t know exactly if my relationship is (part) of the cause of my depression, but I know thinking about it doesn’t bring me joy.

We’ve tried each other hobbies and we’ve tired discovering new hobbies but with no success.

Please give me some advice. I’m feeling desperate.