I thought at first too that you’d photoshopped it! It’s lovely and I’d definitely keep that brick path. It looks to me as if the bare bones and structure of the garden are already there and that you need first to identify as many of the shrubs as you can with the help of the knowledgable people on here.
Once you’ve done that you’ll know if you should prune them down now or wait. That’s a first step. The main thing is, don’t panic and don’t try to do everything at once. Do it in stages after waiting to see what else pops up in Spring.
You said in your first post that you had a sycamore, this really needs removing completely as soon as possible. Then keep an eye out for any more seedlings and deal with them as soon as you see them.
I agree with what others have said. This has the potential to be a great garden and I am amazed that it is already growing so much if it is north-facing. I would certainly keep the path and forget about a lawn in these conditions unless you need a play surface for children. You can offset the focus on the central path by planting which will divert the eye sideways ( tall ornamental grasses or a shrub for example) but you will also need to remember that for sitting out in the sun or growing most vegetables the best and sunniest place is going to be by that fence at the bottom and you will need a dry and safe means of accessing it. As suggested, wait until you know what you already have in there and use the time to think what you want and plan. A raised vegetable bed can be ornamental...the hexagonal ones at RHS Bridgewater are good examples of this and can be scaled down. The nettles are an indicator of good, rich soil so that is good news (and if you want to encourage butterflies leave a small patch of them for the caterpillars). It might also be useful to look at what grows well in other gardens in your area and find out that way what you would like in your own garden.
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that brick path. It looks to me as if the bare bones and structure of the garden are already there and that you need first to identify as many of the shrubs as you can with the help of the knowledgable people on here.
Good luck with your lovely garden.