Louder, please
One of the most common requests from customers is more volume for their mixes.
It is usually possible to make a mix louder (up to 10 dB!), especially in the digital environment, in fact, it is something you can do by yourself any maximizer –almost any plugin brand has at least one.
The thing is, more volume does not mean better quality and a mix will not stand out on a Spotify or YouTube playlist because it has more volume; in fact it is the exact opposite.

Walk in your audience's shoes
When you listen to music in any of these services, ask yourself the question: Would I like to play a song, adjust the volume to my taste, just for the next song to play way louder (or quieter)?