For instance, it is suggested that unlucky people should go out and have more experiences. But perhaps it is simply the case that they have tried having new experiences and connecting with people but were overwhelmingly rejected, thus they learned to avoid new experiences. And as to why they were rejected, perhaps they did not know how to approach people or had some other fundamental issue.

I cannot overemphasize this enough. This, this, a thousand times this. Telling someone to go out and have experiences is useless if they cannot understand how to bias their potential experiences towards positive.