I think that musicians develop an illusion (in general) of being able to “make money” on music. Sure, there are fortunate folks that do. Unfortunately, there are a lot more people not making any money on music.
There are many aspects to the money making of music that is not up to the musician. Music, like all business (since we’re talking about making money on it) has to do with a lot more than the music in itself. In commercial terms, musicians are like lottery tickets anymore. Treat the business part as such.
If you want to become financially independent making music, dream on. Don’t loose the dream, because realistically, that is all its ever going to be, so why not make the music count instead of the money. That does not mean you won’t make people’s life better with your music, but money-wise, get a day job while “waiting” for the big break.
If you want to simply make a living on your music, work at it. Work hard, and get a day job while waiting for the pennies to start dropping in.
Four tracks in over a year, could be on the low side, unless you are extremely talented. Not impossible, but also not very likely. For the first few years I was in bands (young in the 80’s) I made over 300 songs (of vastly different quality, ha ha ha) that never even made it into any live shows or recordings. I still have them in older Steinberg file formats, and no “easy way” to convert them (hint hint, Steinberg, universal project converter).
Ever thought about tunes that pops in the media? There is a reason why people ‘read somewhere that the guy who did that repulsive “all about the bass” track’, i.e. unknown artist, catchy phrase from the song, etc. Virtually unknown, I wonder if someone else made more than £5,000 on that…
Life is very short. Have fun making music, mate!