Best way to safely tie dog outside?

Backstory: I have a Aussie puppy (8months) who is quite the jumper and escape artist. I currently have a not so great fenced yard it is too short even with some makeshift improvements to make it taller. Due to this fence being in the front yard it is harder to replace the fence and make it higher due to bylaws. Originally I was going to make gates on either side on my house so she could use the backyard but unfortunately she has found yet another flaw with my back gate where she can squeeze her little body underneath it. (Gate will eventually be fixed cause it’s already broken from a windstorm.) Also before any questions about her being in the front yard the front yard has the majority of the grass and the backyard is mostly cement and rocks. Working on a fix but I’ve only lived in this place for a year and she was an unexpected surprise

Question: Anyways I’m looking at way she could still be outside but without risk of jumping the fence. And please don’t say train because I am. I am outside with her monitoring and even have her in training class but I do live on a busy road with lots of people and dogs that walk by. I do also have two other dogs so I don’t want to be tangling them if I had to leash her.