This isn't exactly from the direction you may be looking for advice but I offer it in case it may be some help.
A few years ago I got myself into a into a life threatening situation, trapped in it. I was fighting for my life and I was losing. I became so tired that I had to take breaks, and I was able to reflect on my situation. At one point I felt I had no more energy left and accepted I was going to die. All concerns about my life dropped off me and all I could think about was how much I loved the people I know and how I wished them well after I was gone. It was a beautiful moment, maybe the most beautiful moment I've ever experienced. If I'd died at that moment I wouldn't have been unhappy at all.
I'm not special, I have no deep reserve of empathy that others lack, nor am I especially selfless. I've also heard of similar experiences from others who've faced a moment where they were sure death was there for them and they had the time to contemplate it and accept it. It only needs a brief moment.
Perhaps it's not like that for everyone, but those who leave us probably felt something similar because, as I say, I'm not special. They pass on feeling deep love for us, I know that now. I have a friend who passed away in the night from a heart attack, somewhat unexpectedly, and it still makes me want to cry when I think of him, years later now. But even though he probably didn't have the chance of that moment, that feeling was in him for those he loved. I would like to hug him and talk to him again, but if he were to come back, wouldn't he just tell me his hope that I'd been okay and living my life happily and well?
Of course he would.
All the best.