First of all I would like to say :thumbsup: for your fireworks pics. Nice try!
Now looking at the distorted buildings in the 1st to 4th pics as the background looks ok to me & unique, if everything looks straight then it will be very boring. I would suggest you leave it as it is not necessary to make it straight. Maybe you should improve on the colour contrast for the building.
You might want to shoot some more this weekend to improve it & watch out for your colour contrast.