I have access to many European 4G sims with unlimited IG/FB/Twitter. What can I do with them?

As the title says I can get my hands on many cheap 4G sim cards with unlimited data for those social networks, and I was wondering what I can do with them.
Should I sell/rent out the sims to social media marketers/agencies/automaters, use them for my own social media marketing, or a joint-venture with other members?

Any advice would be appreciated.

Thanks!

If you have hands on SIM with unlimited data check proxy solutions.

The most obvious one, sell proxies.

Create a proxy service and advertise it in the marketplace.