Missing someone, what makes it easier?

I've been wondering how others manage when they're missing the person they're estranged from, if there is anything they do that helps them?

I am grieving a death and also an estrangement, and I find it difficult to know what to do to manage this particular aspect of estrangement. When I miss the person who has died, I might write them a letter or look through keepsakes and I come away feeling comforted and more connected to them. When I miss the person I'm estranged from, it feels like the above would just be ruminating and I'd feel worse for it. I know that aiming for acceptance and focusing on the aspects of life that do bring happiness are good things to do generally, but sometimes I want to honour what is missed despite estrangement and I'm not sure how to go about it.