I have tried almost everything but it seems not to work. I would like to know how can we reunite the connection we had.

Give up on it. Seriously, that's the best way to do it.

You also might want to consider providing more details if you're looking for advice.

It is broke for a reason. There is no need to try and reunite. Move on and find someone who is better suited to you and more likely to have a successful relationship with!

One person can't fix a relationship, it takes two, and if only one is participating you are going to get nowhere fast.

What you had is in the past and its gone. Move on