Take a shoe polish black is preferred and apply it over the scratch it will help you visualize those scratches easily.
Wipe the shoe polish off gently with tissue paper over the panel this will leave the scratches filled with polish making them stand out.
Get a Block sand and sand the Panel properly with a 2000-grit Wet/Dry sandpaper don’t forget to keep a bucket of water beside you remember that you have to keep the sandpaper wet, keep sanding the panel until the shoe polish disappears.
Use a high quality compound polish to polish out those sanding scratches with rubber compound.
Use a polishing wheel that will save you a lot of time and will bring the shine back to your cars panel. Prefer to use an oscillating polisher because it is less aggressive than a heavy rotary polisher. Remember not to buff too much you might buff through the pain coat into the next layer.
Make some work out with your hands and buff with a dry cloth to remove the last of the compound. And end the process by a full car wax. Your car is now scratches free enjoy the looks.