So we also have 700 sqm of land and on it about 20 oaks, various conifers, birches, maples, lilacs, goat willows (bee pasture!!), a row of trembling aspens in the south, a row of hornbeams in the north, and so on, and I plant several more trees every year. Cherry, apple, 2 walnut trees, hazelnut tree, 2 firs, serviceberry, winter cherry, etc. I already have. The property is practically a forest, tree after tree. I can't understand these bare new building plots. When I look outside, I only want to see green. When my little trees grow bigger accordingly, a few others that are rather useless will fall instead. But only the small ones. You can't replace such a huge old tree within this lifespan.
What will still come are chestnuts, more hazel trees, and maybe one or two more walnuts. My squirrels are hungry, and especially the winter guests are incredibly expensive (25 kg of walnuts disappear just like that). But I also like my oaks; I have both - sessile and pedunculate oaks.
By the way, the hawthorn smells absolutely wonderful and doesn't stink a bit!
Although there may be a lot of trees, they do not take light from each other at all. The slope is so steep that they practically grow in terraces and do not shade my photovoltaic system.
For that, we have no lawn - saves mowing.
If you want an extremely fast-growing beautiful blue-flowering tree, then please take a look at the Paulownia. That would be something else!