I was able to do that while I was still studying, which mostly involved memorizing a bunch of stuff. The software industry and its endless meetings drain my energy way more
Studying feels like hard work when you are a kid, but it's kind of a joke how easy and non-draining it is in retrospect. Doing actual work is just so much more taxing.
I think it's due to how linear studying is. Actual work on the other hand can be quite unpredictable, it's a bit like a monster of the week show where monsters are incidents, bugs, and unreliable leaders. And there's also linear work on top of it.
Are there any other pieces of software you want to write? Depending on your financial situation, see if you can quit or take off your job for a year and write it. The years aren't going to come back to you, and you don't want to die having pushed off your dream until it was too late...
The number of side projects I have had to leave aside in the last few years is close to a dozen. I was able to implement some of my smaller ideas and I open sourced them, which boosted my career. But I don't want them to be a means to an end, I want to actually have the time to build them properly and make a living off one of them some day.
Unfortunately my country has infamously low salaries while having a relatively high cost of living. I have some savings, but I would burn them at a pretty fast rate if I quit my job. My best chance at having another "miracle year" is getting fired, which would immediately provide me with some more liquid cash plus monthly unemployment benefits for a while. At that point I could move to one of the cheaper areas and be financially independent for years.