While many think you die and go to heaven and become an angel, the Bible doesn’t back that up. But we have this verse,
Therefore, since we are surrounded by so great a cloud of witnesses, let us also lay aside every weight, and sin which clings so closely, and let us run with endurance the race that is set before us. Hebrews 12:1, angel can be that cloud of witnesses, and those who have gone before us could be as well.
I don’t believe they know everything here on earth or that would not be heaven to them, would it? It’s just they are hoping to see souls saved and family members but should they not be, that memory would be gone or as I said it would not be heaven.
I believe people remain themselves, but are in a spiritual, glorified body, that is how we would be like angels. Angels were created and were servants, they never had to be saved, though they are interested in salvation
But it’s safe to believe that the angels are there to cheer us on, to do battle and be our guardians. And while we are to run a race with faith, we are also to rest in His love and to seek His peace, He has already given it to us, but we must just look to Him.