Tool prevent back button like wpzerobounce

Hello everybody

Atm, wpzerobounce not work
I can write a new plugin like that, but how to earn money from it ?
I bought traffic in Fiverr but it almost bots and hard to earn money

Does anyone know any way to help me make money from it ?

Thank you

Make a free Plugin and later you upgrade it on monthly cost or 1x Payment.

How much I should sell ? (1x payment)
Does anyone have any other ideas to make money?