Little birds in the trees like that are hard. they don't sit for any amount of time at all, and to get a good shot you have to really follow them around as they flit from branch to branch. it takes patience, and a lot of "not-quite" shots. The one you have is well done, other than being the wrong end of the bird...

Nothing wrong with cropping it a bit to make the picture about the bird instead of the tree-that-has-a-bird.
You'll find that low ISO generally doesn't get you very good long-lens bird pics, because you can't get a fast enough shutter. I don't know how good your D5200 is at higher ISO, but you ought be able to shoot at ISO 400 at least. Aperture priority is not what you want with birds, either, as you might get one in the shade and find yourself with a 1/30 shutter, or even slower. you want shutter priority, fairly fast, like 1/500 or faster, and watch your meter in the viewfinder for exposure; if it shows LO, raise your ISO. If you can't raise it enough and be comfortable with the resulting noise, lowering the shutter speed is the only choice, but you risk motion blur.
In motorsports, the first thought is to use a very high shutter speed to freeze the fast action. That works, but makes for dry images. You want to learn to pan with the subject as it passes, and use a shutter around 1/125 or even slower. If you do it right, the car/bike/snowmobile/whatever is sharp but the background will show blur, implying motion to the viewer. Moving parts of the vehicle such as wheels/tracks will also blur. If you haven't done it before and will be learning as you go, expect a lot of throw-aways, but one or two really really really nice shots.