Run the songs through a DAW with a mastering plug that can adjust to a specific level. Then you should also test it by playing the song to verify.

All the songs on the radio are set to certain standards so you, the listener, aren't constantly grabbing the volume knob. Do the same thing with your music

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.