sending you a warm welcome.That feeling of isolation is a terrible thing, and i know what you mean when you say being with others can make it feel even worse.I,ve found online learning, and in summer doing gardening has helped shorten those evenings a lot,but for me i,ve never been a socialiser, my husband was much more social than me. For others this isnt a problem so what works for one person doesnt for another. My solution really has been to find a goal and then gradually overcome the hurdles that get in the way of reaching it which for me are around social anxiety. So for example could you consider something voluntary where everyone there has the same goal but other interests and therefore friendships evolve from that,- or perhaps your local college has an evening class again where people go because of a common interest which becomes an ice breaker.
We have an everyday chat section on here as well as mutual support through grief itself - its just exactly what it says, because sometimes as we move along this journey its the little stuff we miss, some-one to share your day with, talk over everyday issues -how to do something,what i read/ watched,the birds in the garden,what colour to paint the wall what to have for tea. Anything at all.