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Right now and based on very little research, it seems that Cloudflare can help you implement such a feature or using the Google Optimize Plugin.
So are there any others ? Which one is the easiest to implement, since I need to turn over the site to people who will need to create dozens and dozens of A/B testing but are not technically savvy.
Thanks.

Google Optimize has been sent to the Google graveyard. CloudFlare can help with A/B testing but it would require developer knowledge.
I would use someone like VWO or Nelio which is specifically for WordPress.
I use [this plugin](https://absplittest.com/), works very well. Of course, you need some traffic for the tests to be meaningful.
If you run a VPS this is definitely viable and very lightweight (won’t hurt performance nearly as much as Google Optimize):
https://github.com/mint-metrics/mojito
The main repo hasn’t been updated in years, but the project is definitely still active, one of the dependency repos is still [active](https://github.com/mint-metrics/mojito-js-delivery).