Injured bird found - what to do?

Evening all,

I was out on a run and decided to go a bit further, along the main road I heard a little tweet and saw a little bird infrequently hopping about. With what appeard to be an injured wing. I ran past and left it, but I then felt guilty and went back to collect. It was picked up using my socks as I had nothing else handy and carried home. 

It had a small amount of blood on the sock and on its leg when I looked, so it was definitely Injured. 

It's currently in a box with some holes for air and some towels for comfort, but im unsure what to do. I know there are huge cuts with the covid-19 outbreak, but what would be the most ethical thing?

My only idea was to release it Into a nearby park or a closer cemetery to where it was found. Most of the area around is dense with houses and main roads, so I wouldn't feel comfortable letting it back onto the pavement. What else could be done? 

Really appreciate your help/advice :)