For example, none of my publications are on there anymore, I lost all citations and RG score. But the photo and title are correct. And my inbox is still full of inquiries. How do I get back the profile I built over 15 years?
Most probably, your publications are still at ResearchGate, but no longer attached to your profile. You may check this at https://www.researchgate.net/profile/Katherine-Santos-6/unconfirmed (visible only to you). However, contacting the support team may be an easier way, provided they will be able to restore the previous state of your account. At least they should be informed about this problem.