Shoot tighter. There's more than enough extra space, and a certain amount of lean going on with the buildings so maybe a lens that isn't quite so short would be better. Change your vantage point, move around and get different and better perspectives. If something in the frame isn't adding to the composition it shouldn't be in the photo. Get in more practice on framing shots and adjusting vantage points.
The first one needs more car and not so much building The second one is a good idea framing with the flowers but there's too much out of focus area in the foreground of the composition; that takes up almost a third of the photo. The third one needs to have less street with blacktop drizzled on cracks in the road, and you don't need a bright noticeable yellow sign on the parking garage (that can be a visual distraction and take the viewer away from the subject, the car). With the last one frame more to the right; eliminate all those posts and poles, etc. back there.
Good idea with the holiday lights, so next learn timing. Get set and wait for the red light to change; as soon as those cars move out of the frame get a shot before the next red light. And yes, it can take some time and persistence and a few traffic light changes to get the shots.
For money making use you may need to get property releases for including recognizable buildings. Try ASMP or PPA for info. on licensing usage, etc.
You have a lot of good ideas, now start learning to check the background first, move around til you figure out a good vantage point, and shoot tighter. You seem to be on the right track, just keep learning and practicing skills til you get to a competitive professional level.