More taxes, and use that money to create a publicly-owned competitor. If the private sector wants to compete, they’ll either have to be better or cheaper than the public option, or both.

Also, re-nationalize the infrastructure. In Canada, taxpayers paid for hydro and telecom construction, then all of that infra was included in the privatization of those sectors. Bell has been profiting for decades by charging people to use the copper that was installed on the public dime.