There will always be more problems to solve and potential opportunities to explore than you have the resources for.  How do you deal with this individually and as a team?  

• Working hard is a big part of the solution.  Waking up early and staying a little late never killed anyone.  
• Working efficiently is also critical.  Work with urgency and accuracy without over-processing.

These however are just prerequisites.  The real issue is how you prioritize and sequence what you are working on.  If you are leading a team it is how effectively you align the team around prioritization and execution.  This gets exponentially harder as your company grows.  

• The Martian is a great movie focusing on how an astronaut and NASA solve problems.  
• Extreme Ownership spends a whole chapter on Prioritizing and Executing 
• The 4 Disciplines of Execution is about how to align a larger team around priorities 
• Objectives and Key Results is a management system aligning individuals, business units and the company around a quarterly prioritization and execution operating rhythm.  
• Last Planner System is a tool for helping project teams prioritize, execute and learn.