Who can help me stop someone from repeatedly logging into my accounts from the United States?

I need assistance. Someone from the United States keeps logging into several of my accounts, and I don’t know who they are or why they’re doing it. I’ve just secured my email address and changed my password multiple times, hoping this time it will be effective. Who can help me with this recurring issue?
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I fear for my safety. I need to constantly check if someone is using my accounts when I’m on the app. I don’t feel safe anymore and fear for my entire existence.
Who can help me stop someone from repeatedly logging into my accounts from the United States?
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