Do I give up if the dad to be isn't responding?

I just found out I am pregnant to a guy who was part of my life for 6 years. He is not a random person we were both in a relationship until we both discovered we are toxic for eachother. I've tried reaching out to him multiple times to let him know about the pregnancy but he has my number blocked he rejects my call if I try calling on a private number and he hasn't responded to my email either, not sure if he has also blocked me on Gmail as there is a way to block people from emailing you. Do I give up reaching out to him or do I try one last time by writing him a letter and posting it to him?

Going to his house is not an option as he starts work just as I am finishing work myself.

Do I give up if the dad to be isn't responding?
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