Okay so here's a few points worth considering:
Device fingerprinting, because cool changed the IP and email, but Meta can track other factors of your connection like browser, hardware, fonts, screen resolution, timezone, so a lot of details that can help add margins for their bots to fingerprint users and track what appears to be unique access. Fresh IPs and emails + anti-detection browsers help by a lot, but consider the other vectors of detection too. Payment method is also a consideration, and so is warm-up process.
There may be other points I missed but off the top of my head, I'd look into those ones first.