From the picture you’ve provided, there’s no theme to the icons you’ve used. Some of which are washed out, some have totally different designs.
What I can say is be consistent with your use of UIs- keep one theme, not multiple.
I wouldn’t be able to do it as you have the picture files. The first thing you would want to do is find the size of the ImageLabels/Buttons.
Use that size and make the buttons using that size. The more consistent and close it is, the less blurry and unclean it looks.
The image you gave me is a 6080 by 2080 which is way too large for what your working on and using it.
Remember, the larger the image, the more blurry it becomes when it is shrinked down to fit.
Thats all I could help with, other than that, good luck!
Edit: Change the artboard size in adobe illustrator to fit the button sizes then shrink the buttons to fit with the new artboard. That should make it better.