If the workload has grown beyond the development team's capacity during Sprint planning, the most sensible action is to collaborate with the Product Owner to potentially remove or change items. The goal is to adjust the Sprint Backlog to fit within the team's capacity while still delivering value. Working overtime is not a sustainable solution, canceling the Sprint disrupts progress unnecessarily, and recruiting additional team members mid-Sprint is impractical and goes against the principles of a stable, self-organizing team.