Spirit and thought require a physical architecture to run on. There is no evidence whatsoever that thinking can occur outside of a physical architecture. I think it is highly unlikely in the extreme that a person’s essence could somehow survive death. So, no. You better get your haunting in during this life if it’s so important to you.
You have asked at least one other question about revenge in which you said you didn’t really want it. You just wanted the hurtful stuff to stop. The best way to get the hurtful stuff to stop is to give the people doing it exactly the same thing. This is not revenge. It is deterrent. There’s a difference. With revenge, you want to hurt someone. Deterrent is designed to get it to stop; preferably without having to hurt them.
Forgiveness is another thing. Forgiveness is not for the person who hurt you; it is for yourself. It allows you to let go of your pain and resentment, and move on to do things that make you happy. You want to stop dwelling on the past. Ghosts are about dwelling on the past. They symbolize this obsession and the wish one could make things different, or at least haunt people who created the problem. They are about guilt and pain, and if you want to be a ghost, it is because you can’t get past what made you want to be a ghost.
That’s harsh, I know. You may not agree—at least, not now. But think about it, please. I do not say this with malice. I say this because I don’t like to see people in pain. The ghost you want to be is your pain. I hope you can let it go.