Volunteering is the key, I feel, as others have said. Choose something that is important to you. It doesn't have to be heavy duty stuff. I volunteer at the local community library, which is entirely volunteer-run, so lots of different roles within that. I have made several good friends, and lots of pleasant acquaintances. After my husband died, I volunteered as a committee member for my local Dementia Action Alliance, which led to me becoming a Dementia Champion, running Dementia Friends sessions. This has also led to friendships. Since lockdown, I've been involved in a weekly Zoom current affairs group and I run another email-based one for the regional Humanists' group. All these have kept me sane and grounded since my husband died 6 years ago. I am lucky to have 2 daughters a short drive away. I am bubbled with one, but I am aware of give them space to live their busy lives and not be dependent upon them for my social life. Good luck, and why not let us know how it's going in a few months.