It's common to get carried away while compressing. To understand when to stop compressing, bypass your compressor while listening. If your track feels like it can't live without the compressor, you've hit the sweet spot. If it doesn't make a difference, you don't need compression. Another good tip is to check the next morning with a fresh pair of ears, or check on multiple systems/get another engineer's feedback. Repeat until you get the right sound. Music production is all about making mistakes and finding out what sounds best. Do not be afraid to crank your compressor and find to what it's doing to the sound.