First Puppy

I’m new to puppyhood. My dog is 5 months old, he’s a bernese mountain dog. My first ever, girlfriend had one before but he passed about a year into me moving in with her.

I’m trying so hard to be patient, work on eye contact and engagement. Even in the yard/driveway he just, does not pay attention. I try to walk and have him engage me and pay attention but it quickly goes away after 3/4 steps. How do i proceed? I’m getting frustrated, I know it’s a marathon but it’s a frustrating one.

How can I improve his engagement with me even in low distraction environments?

Currently we’re sitting in the park, it’s a high distraction environment but, I wanted to get him out and have him observe for a bit.

Thanks!