From 2020 to now, ESS's revenue ratio has decreased significantly. Through research, three potential problems were found: (1) Decreasing in customers, (2) the Number of orders declining and (3) Low inventory turnover. The validation process shows that the first issue is the company's core problem. Subsequently, more interviews and further research were performed to determine the cause of the central problem. The result is (1) Poor marketing management, (2) Poor HR management and (3) Weak customer management. Finally, weak customer management was identified as the main cause of the central problem. Following that, two different remedies were devised in the hopes of fixing the issue. The second alternative solution was picked as the most appropriate approach to this problem, and a plan of action was created around it. For this thesis, both primary and secondary data were employed. This paper was written solely for educational reasons and should not be used for any other purpose. Any citations or quotations should only be made when the author's permission has been granted.