My father has had a significant influence on me.
This is the only sentence I have read, and I wanted to stop and tell you it was boring. This is a chance to learn a lesson about hypnotizing readers. Do not begin with a wimpy sentence. The first sentence is like the Viking that rushes into battle.
Nor is it the masculine influence of responsibility and commitment. Not even the essential wisdom of changing a flat tire. I don't like this part, because it has a sort of offensive implication.
But the rest of the first paragraph, aside from what I am complaining about, is excellent.
My father's truancy that day was the result of an alcoholic marriage which ended in a sobering divorce.--- This is a great sentence.
My challenge for you is to go back and take out at least 10% of the words. Delete sentences, condense them, explain more efficiently, and do whatever is necessary to cut out 10%. That is refining writing.
Also, I think you should use shorter paragraphs. The material is deep, so readers need time to absorb it.
:-)