How do you convert freemium to paid?

How do businesses effectively transition from a freemium model, where users can access basic features for free, to a paid model where users need to pay for additional features or services? What strategies can they employ to encourage users to upgrade and make the transition as seamless as possible? Is it important to offer a range of pricing options to cater to different user needs and budgets? How can businesses communicate the value of their paid offerings to potential customers and overcome any resistance to paying for services that were previously free?