Loving my past self

Hi, I want to create a relationship with my future self, I would love to know which lesson is the best for this.
And during my 20 mn session, my coach told me about writing a letter to my past self and my future self.
I find hard to write to my past self, as I’m not where I want to be in life, and there are things I did in my past that I am not very happy with that led to not being in a good position financially now and to not be in a relationship.
The coach said I need to love my past self. I think I need help and guidance to know how to do it.
Thank you!