design: what technologies should I use for fingerprinting (fingerprint of the device)? What development strategy should I use?

I am a provider of online surveys, and due to the nature of my business, I receive many frauds and duplicate users for my surveys that I can not control because of cookie restrictions.

I want to implement digital fingerprint tracking to track the uniqueness of the respondent and block unwanted respondents.

I want to know what technology I should use for this project (which can handle 1000 – 1500 requests per second or more).
I also want to know what development strategy I should use for this project.

So far I have tried with Fingerprint JS, some examples of cookies, but according to my traffic that is close to 1 million per day, this can not work at this time.

All kinds of suggestions and advice are welcome and if this is not the right place to ask this type of question, please let me know, where to ask.