How do you let go/move on?

I recently lost someone dear to me and I don’t know. I went through a state of feeling like my whole world was falling apart. I was always looking down and just feeling ugh. I thought I was getting better but no. One day I just decided to write a letter of unspoken words and I just bawled my eyes out. It felt good. I’m definitely better now. It just makes me sad that that person won’t ever be there anymore. If by some miracle (which will never happen) they came back to life, how would you spend your day with the person?