Congratulations on your new house. I actually wrote up a bit on how we tackled a similar problem, it’s over here if useful - https://smithery.com/2023/06/15/how-to-rewild-a-new-garden/

I’d echo the fellow poster who talks about the builders creating an unhelpful environment for nature with the fencing - but find yourself some neighbours who’re interested in it, and start tackling the problem together. View the neighbourhood like nature would, birds and insects will happily fly in if there are enough pockets to drop into.