I am of course aware of that.

But reducing loneliness is just a means to an end. My point is that there exist a lot of rewarding things that you can do alone at home, which may give you a hapiness malus because of the loneliness, but also a happiness bonus because you like the activity.

If a solution to reducing loneliness shall be sustainable, it better increases the happiness or rewardingness overall, too. Otherwise you see loneliness as a problem, but see the alternatives as being the worse options, i.e. by rational choice, the loneliness will not be reduced.

You can be happy, well maybe content, but still lonely. It sounds like you're just trying to optimise your happiness, which is fine for you.