Your answer resonates with me a lot. Disclosure: I'm not a founder, I'm still employed.
A very important insight for achieving my peace of mind was to have multiple sources for a feeling of accomplishment. Peace of mind is the state where I'm feeling fine and not lonely or bad.
My sources are: Family and friends, physical activity and work. If one of the sources temporarily is running dry, I still have two other ones to rely on.
My sources are very parallel to the activities you picked up in order to counter your loneliness.
A very important insight for achieving my peace of mind was to have multiple sources for a feeling of accomplishment. Peace of mind is the state where I'm feeling fine and not lonely or bad. My sources are: Family and friends, physical activity and work. If one of the sources temporarily is running dry, I still have two other ones to rely on.
My sources are very parallel to the activities you picked up in order to counter your loneliness.