There tends to be an emphasis on marketing newer songs within an artists catalog.
This makes sense as newer songs are more in-line with an artist's current brand.
But this doesn't mean you should discount other songs in your catalog because they are older.
Remember this: your music is new to anyone to hasn't heard it yet.
If you have a song that is 2 years with 2,000 streams, it's okay to promote it in the same way you would a song that is 1 day old. Viral hits like Truth Hurts by Lizzo didn't pop off until two years after released!
Artists get surprised when older songs outperform more recent songs from their catalog. This is likely due to the fact that the older music didn't get enough marketing attention from the start.
You can now pick which campaigns to run now that you know where you are in the music marketing lifecycle: