The stakeholder responsible for ensuring that the customer realizes value from solutions coming up for renewal is the Customer Success Manager. Their role is to work closely with the customer to ensure they are achieving their desired outcomes with the solution and to address any concerns that may affect the renewal decision.

The goal of the Quarterly Success Review is the alignment of priorities and outcomes while celebrating accomplishments. This regular review is a strategic meeting that allows both the customer and the organization to ensure that they are aligned in terms of business priorities and desired outcomes. It's also an opportunity to recognize and celebrate the successes and milestones achieved, which can be motivating and reinforce the value of the investment in the solutions provided.
References:
*Cisco's official page on Customer Success Manager certification2.
*Skilljar blog on scaling Customer Success with Quarterly Business Reviews3.

Two barriers to adoption within an organization are inadequate knowledge and skills, and organizational silos.
Inadequate knowledge and skills refer to the lack of necessary training or expertise among employees to effectively use a new solution. Organizational silos occur when different departments or groups within an organization do not share information or collaborate effectively, which can hinder the adoption of new solutions across the organization

Two common adoption barriers are a lack of resources and the loss of a project sponsor. Both can significantly impede the adoption process; lack of resources can prevent proper implementation and use, while the loss of a project sponsor can lead to a lack of support and momentum1.