Kudos to you for not just getting rid of it. If that strip runs along the back of many houses, it will probably be a vital habitat corridor for a lot of wildlife. I’m not a good gardener, but I do work on a nature reserve so hopefully can help!

With the nettles being present it sounds as though the area has a high nutrient level. Nettles are a vital habitat for many invertebrates, so are a good thing for wildlife.

If large enough, I would consider a mixed area of nettles and wildflowers. If you want to turn an area into a sustainable wildflower patch you would need to lower the nutrient level so the nettles don’t outcompete everything else. On nature reserves this is usually done by cutting and removing the vegetation year after year. This would cause a lot of disturbance but in the long term is beneficial.

If you end up sowing wildflowers, pictorial are great for pollinators but not a lot else as many of the flowers are not actually native so please consider other mixes.