What should I do?

So I don’t know if I should try to talk to my dad still or not. A little back story. Me and my dad talked to each other and seen each other every other weekend untill I was about 14. Our relationship was okay. We were just both shy so it was a little awkward. But we still managed to have a relationship. When I turned 14,I was just going into high school. I ended up going out on the weekends you know being a teen. And it eventually got were I didn’t go over to his house anymore. We got into an argument because he asked why I never wanted to come over. And ever since then our relationship hasn’t been great. We would text each other every now and then to see how we were but it stopped along the years. When it was my high school graduation I personally went to him and invited him. He said he’d try but never showed. A year later we asked how each other was and that was it. Well a couple of months ago I got his number and asked how he was. We had a little conversation and that was it. A bout a month ago I texted him asking if we could start over. Forget the past and start it all over. I told him I didn’t want any money or anything just a relationship. He never responded.

Me and my husband is trying for a family and if it happens soon I want him to be in my kids life. I don’t want him to pass soon and I regret it. I don’t know if I should continue to try and talk to him or just give up? I’ve also thought about contacting my step siblings and seeing if I can get ahold of him that way. What should I do?