Suspicious Account Activity

Hi all, I hope this format works for my problem here.

So in the past month or so, I've gotten some unnerving experiences with various accounts. Just today, my reddit accout was "suspended due to suspicious activity" for the second time (both happened within a month of each other). I have this as recent activity I do not recognize:

45.13.30.143 unknown user-agent Canada 9 days ago Primestar Enterprise Group, LLC

213.108.160.85 unknown user-agent Czech Republic 13 days ago PRO-COMUNICATION s.r.o

51.38.66.6 unknown user-agent France 13 days ago OVH SAS

91.103.208.114 unknown user-agent Russian Federation 16 days ago OOO WestCall Ltd.

These seem like VPNs or something to me, and I don't recognize any of them. There are a couple other IPs, and the most recent 2 are different, though they are just from different devices and buildings (work computer, home computer). I wonder whether the account was locked due to this activity or the ones listed above.

Edit: forgot to mention, I do have extensions for "Reddit is Fun" and "Nuke Reddit History", so that may be the cause for two of these. Not sure if relevant, but maybe worth mentioning.

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Second thing, I recently got a password reset request to my email from my old Runescape account, which has been out of commission for very nearly 8 years.

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Last thing (edit), I do have one monthly recurring transaction by "Netflix", but when I tell Netflix the account number of the card they are drawing from, they say they don't recognize it. Additionally, I can't seem to find any of my old accounts (i have a few of them), so not sure if this is well-disguised stealing or if Netflix is just incompetent.

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So it sort of seems to me like someone knows my email and maybe some passwords, so I am wondering what I can do to make sure that I don't get memed by someone with nefarious intentions. My important accounts that I have card info on have unique and un-linked passwords that I either remember or keep written down physically, except Amazon I guess. Any suggestions as to recommended action? I'm due for a new Debit card soon (I literally just have one debit card and no credit cards), so I was thinking that replacing it and getting a new number for my checking account might be the best way to keep safe at this point.

Again, any info, feedback, or suggested action appreciated. I'm fairly tech savvy but cybersecurity is one area which I am dangerously lazy.