Happiness is a state of mind, and therefore it comes only from WITHIN our mind.
And what is in our mind is whatever we have previously fed into it. We CAN change this over time.
Relationships only make happy people happy. Yes, the temporary state of infatuation is very exciting, but it always dies out and then the stronger our infatuation was, the more unhappy we end up being.
So if you are not happy with your love life, START by learning how to be happy. And by learning how to genuinely care about other people.
And don't look on dating apps for someone . .that is begging to be disappointed. Meet someone in person .. join interest groups that share your interests, and if you don't have interests .. then get some.