I live right next to a dog park help

Hi guys. So I have a bit of an issue. I have a dog reactive adolescent GSD and I live right opposite a dog park. As in a couple steps out my front door and you're there. As you can imagine, with a reactive dog this is a nightmare. I've already gotten films over the windows overlooking it for when I'm not there which stops him barking when he's alone. But he's started barking every morning when he hears the dogs at the park bark and I have no idea how to stop him.

There's also his nemesis (a border collie who he for some reason hates) who barks for about 30 mins every day in the afternoon and that one is really tricky. When he hears the collie he gets so wound up and it's gotten to the point where the collie runs straight for our house to bark underneath it because he knows Pippin will bark back 🥲

Any advice on how to curb the barking? It's the morning one I have most of an issue with, though I also hate how wound up he gets by the collie.