I got a ransomware email spam. How did they get a portion of my password?

I got this email:

I know, Go49ers (not actually what it says, just using that as an example), is your password. You don't know me and you're thinking why you received this e mail, right?

Well, I actually placed a malware on the porn website and guess what, you visited this web site to have fun (you know what I mean). While you were watching the video, your web browser acted as a RDP (Remote Desktop) and a keylogger which provided me access to your display screen and webcam. Right after that, my software gathered all your contacts from your Messenger, Facebook account, and email account.

What exactly did I do?

I made a split-screen video. First part recorded the video you were viewing (you've got a fine taste haha), and next part recorded your webcam (Yep! It's you doing nasty things!).

What should you do?

Well, I believe, $1900 is a fair price for our little secret. You'll make the payment via Bitcoin to the below address (if you don't know this, search "how to buy bitcoin" in Google).

BTC Address: bc1qp9tqyxxrs8s8ul02vlsh6l0cqnelsnaee58c9m (It is cAsE sensitive, so copy and paste it)

Important:

You have 24 hours in order to make the payment. (I have an unique pixel within this email message, and right now I know that you have read this email). If I don't get the payment, I will send your video to all of your contacts including relatives, coworkers, and so forth. Nonetheless, if I do get paid, I will erase the video immidiately. If you want evidence, reply with "Yes!" and I will send your video recording to your 5 friends. This is a non-negotiable offer, so don't waste my time and yours by replying to this email.

Flor

I'm read that this is just a common spam email. However, Go49ers is a common password or part of a password for me. How did they get this? I'm pretty sure I don't have any keyloggers on my computer. Ironically enough, I ran through the r/techsupport Official Malware Removal Guide and installed a Kaspersky subscription on all my computers within the last week.

So, my questions:

• How did they get part of my password?
• I will change any passwords that have Go49ers in them. Is there anything else I need to do?

Thanks for your help.