Upsell or Upselling in SaaS is a strategy that involves offering a customer a more feature-rich software version than they are using or considering purchasing.
Upsell vs Cross-sell
Cross-selling is a strategy designed to sell additional products to an existing customer. For example, if you’re selling software as a service (SaaS) products, you could suggest related services. Whereas upselling refers to offering an upgraded version of the software.