The older you get, the harder it is to make new romantic relationships.
You can sort of make up for this by having extensive experience younger in life, so you can more aptly navigate the fewer opportunities you'll have as you age.
If you don't have that skill, good luck.
I don't think therapy is capable of really teaching this either. You can read a book about how to play soccer, but you actually need to spend ten thousand hours with the ball. If you start playing soccer at 3yo, you'll be a natural. If you start at 30yo, well, it can be done but it's not going to look very traditional and it's going to be much harder.
I think the "pickup artist" movement and the rise of people like Andrew Tate illustrate the problem well. Applying a deliberate strategy to engineer romantic relationships usually ends poorly, but I can see why so many men are attempting it.
This is unfortunately more complex than simple, easily fixed social issues and the like.