What to do after anonymous complaint caused legal threats?

I recently sent an anonymous email to the HR Director, with the client in CC, to highlight unethical practices such as agents using drugs, third-party apps, and favoritism. My intention was only to improve the work environment, not to harm the company or cause any business loss. Following the email, several agents were terminated, raising questions about whether their actions were already problematic or if the company acted too hastily based on an anonymous complaint. In a subsequent meeting, top management expressed concerns about business loss and defamation due to the email and even suggested possible legal action. However, I never intended to defame anyone or cause harm—I simply wanted to address unethical practices affecting the workplace. Now I am unsure how to proceed. Should I remain anonymous? How should I handle potential legal threats and reassure the company that my intent was solely to promote a healthier work environment?