Back when I lived together with my grandparents I used to go over the field, to get to a young forest growing on top of a former dumping ground ... Walking trough the forest I could see how the chemicals from the trash in the ground affected the growth of the plants. A large set of the trees were weak and rotten, while still standing up right, holding each other up with their twigs.
The ground was covered in nettles.
While the nettles were beautiful, I found the forest lacking diversity. So I decided to spend a few weeks creating a little niche inside the forest. At first I removed a spot of nettles and brought some dead leaves and branches here. The idea was to create something for insects to hide and live in. Ideally the insects would also be eaten by larger animals, such a birds or mice, which are eaten again by bigger animals, creating a food chain. Of course there were already plenty such food chains before my well-meant experiment ... yet hopefully my efforts increased the diversity of the foodchains, creating niches for a variety of animals and plants.
Next I sow some wildflowers next to the leaves and dead wood.
Removing the fast-growing nettles from time to time until the plants were big enough, a little wildflower field grew. Again, I hoped that a variety of insects would accept the new food source, enriching the diversity in the ecosystem.
Due moving places shortly after, I wasn't able to further observe the effects of my little niche.
I hope the rotting wildflowers and the animals coming with it increased the quality of the soil.
Maybe next year the flowers start growing again, that would be wonderful! Then the niche would have a circle on it's own, be like an ecosystem inside of a bigger ecosystem.
I know ... it probably is Winter where you live, but maybe keep the following idea in mind for the coming Spring: sow a field of wildflowers! You are likely to get wildflower seeds in your local hardware store. Sometimes there are also local nature protection organizations gifting you a little bag for free.
If you've a garden, sow the wildflowers there, they don't need much space. If you don't: is there a neglected, public spot nearby? You could try guerilla-gardening your seeds there.
Next Spring, make a tiny wildflower field and help the nature around your home to flourish.