3820 unwanted subscribers. How-to delete

All of a sudden I’ve got 3800+ users as subscribers. No idea how they got there and want them gone… BUT~ can’t find a way to delete that many.
tried to delete just 20 but that won’t work either.
tried to delete 500 but that won’t work either BUT I’m shifted onto a site not accepting.. etc.

Is there any way to resolve this?

Operating system Mac os ( iMac)
Browser ~ Chrome
Hosts ~ Nimbushosting.co.uk

Elementor Pro page builder.

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