Visiting Jordan - 7 days

I want to spend 7 days in Jordan, maybe around April time. I have Amman, Jerash and Petra as my main spots to visit, would 7 days be too little or too long for these 3 spots? I also would love the idea of hitchhiking to each place, though would happily just go on a tour/get buses. Is hitchhiking safe/easy?

I love immersing myself in the local culture and spending time with locals where possible so if there are any locals to Amman/Jordan that would be kind enough to share some tips or advice that would be amazing ❤️