Well, you could just resize it
https://i.imgur.com/wN7BiLw.jpegOr resize and extend
https://i.imgur.com/qAdtngF.jpegThe problem is it's pixel art
when you resize it, the pixels get interpolated, so the sharp edges kinda get blended together and it ends up looking a bit blurry
pixel art usually only looks clean at original size or exact scaling (like 50%, 200%) with no interpolation. so yeah, that's why it doesn't look as crisp after resizing
to get the best results you probably would have to pay an artist to rebuild it pixel by pixel, could be pretty expensive tho
feel free you use it if you want