Solutions for bad traffic?

I have issues with bad traffic (mostly bad actors and bad robots) and I waste a lot of time banning proxies, but it seems like there is no end to it.

I am looking for alternate solutions such as IP filters or phone verification.
Huge IP filters can have a dramatic impacts on performance so it would have to be an external service.
ipqualityscore has a proxy filtering service but it's extremely expensive (500$ for 500K queries)
I haven't found much info about phone verification service and...

Solutions for bad traffic?

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