How shall I detect and remove Keyloggers from my Mac?

I have been using Mac and specifically Safari browser. I recently was hacked and told that my password via email. No one has physically accessed my laptop other than me 100% as I have been working from home for months. The hacker told me that they got to know my password via Keylogger and since the password was unique and not my name or general info about me or even to similar to it, I am convinced there is a Keylogger here. Since then I have been looking everywhere but have not been able to find any Keyloggers. I have re-installed the OS X and subsequently installed anti-virus(Bitdefender and Malwarebytes) but I am not sure how helpful they are. I have also changed all passwords but I am still scared there is a Keylogger or it might come again. I am scared and need advice.

Thanks and Regards