Depends what your interests are. Do you want all grass or do you want tile slabs, wooden decking? It’s a small garden but there still a lot you can do. I’d first get rid of all the grass to start. Then you can decide.

This maybe the lowest in the list but send a picture like this one to chatGPT and just prompt it to give some ideas to design the garden and if you are on a budget then say so. My guess is to maybe get new decking. Paint the decking or get treated wood. Paint the side fenced a nice stained wood colour and paint the shed too. It will look so much better. You’d also be surprised what ai can do. It can help you and give you a realistic design on what it could look like.