Con
Not to be an ass or anything, but I am not sure what exactly you cracked/reverse-engineered or what you are keeping as secret. The only hint I am getting is that you are bad at googling. "Hidden APIs" have been documented since these social apps hit the app stores. One of the pioneers in this was Stevsie (a quick google/youtube search and you'll find him), although lately his site doesn't show this kind of juicy info, probably has been Zucced.
A quick Google/ChatGPT for "Instagram hidden api" and you'll get dozens of GitHub repos ready to fork and go.
I did this with instagram back in 2019, but also others, including TruthSocial (this one was so easy, you just send 2000 requests to like a post and it just worked lol).
Not here to ruin your thing, I know whats it like to hustle and invent/build from scratch, but you should upgrade your research skills.
PS: nice that you found and use(d) curl_cffi, if you still haven't figured this out, use it asynchronously, it's faster this way, ping me if you need help.
PS2: I just entered stevesie's website in the wayback machine, and in 2019 his website has like 44 hidden APIs, not sure if those still work, but worth a try!
Good luck!
PS3 damn I havent posted here in like 3 years hah, time flies