If you feel that further research is required in order to fully develop the optimal solution to the problem, tell your readers. Then, briefly describe steps that you suggest and their rationale.
If you feel that further research is not required because you believe that you have proven that your hypothesis-solution really does solve the problem, tell your readers.
If you feel that even though your hypothesis solution really does solve the problem yet new problems or new questions arose that require further research, then tell your readers. Then, briefly describe the new problems and questions. Always keep in mind that you much communicate the “value” and “significance” of problems, ideas, solutions, etc