I am sorry for your lose there.
My suggestions are the following
1. I am hoping you were using Solutions for your Power Pages and that you have exported Versions both in managed and unmanaged, in which you can restore the Site (not the data)
2. You can check if you have any Dataverse / Environment Backups and if so restore one of them that would have your Site and your data. You may or may not lose some level of data but its better than zero
3. If you only care about the site, and if you paid a contractor, although they should NOT keep a copy of your site, maybe they did.. ask them
4. do you have any other environments that you push too? You can grab it from there and work backwards (meaning take from Prod and put it back in dev, EVEN if its in a managed state only, there are ways to make it edittable again)
Other than that... You would have to really really have to beg push, borrow etc a favor from someone at MS who can in fact get it back. If its truly hard deleted and all the compliance and governance copies are gone and you have no solutions and you have no environment backups then there is nothing you can do.
I am sorry I hope that one of my suggestions helps you.
If so please mark the solution as such and again I am sorry :-( for your loss.
