I would try to develop a "hobby" and would travel to a meeting or get-together of some kind related to the hobby, where you could go with or become friends with others as you liked, so the hotel would not seem so depressing. Or, just doing a "group tour" thing of another city or sites, might help; you could go along and just listen and not participate, but it would get you out of your immediate environment/head for a bit?

I use to "live" in my local library, at lunchtime/breaks to get away from work or in the evening and on weekends to get away the loneliness/myself. Taking a course at a nearby or online establishment can provide an "excuse" to get away and means to meet others?