<p>Soft soil deposits in the coastal regions are prone to creep deformations under prolonged loading conditions. The current study optimizes the settlement of the embankment at the centre and lateral displacement of pile head using Taguchi method. The embankment slope is stabilized using vertical piles installed at its crest to provide lateral support and reduce deformation, while geogrid reinforcement at the embankment base helps in load distribution and further controls settlement and lateral displacement, demonstrating the complementary roles of these two stabilization techniques. A total of 54 numerical analyses were conducted using combinations derived from an L₅₄ orthogonal array to represent a comprehensive spectrum of parametric influences. These combinations (L₅₄ orthogonal array) are designed using Taguchi method in Minitab software. Spearman rank, Kendall’s Tau, and Pearson correlation analyses were conducted to assess the correlation of various parameter with the long-term settlement and lateral displacement, while sensitivity analysis determined that the modified creep index (<i>μ*</i>) was the most impactful parameter, influencing settlement and lateral displacement by 9.54 and 9.13%, respectively. The parameters considered for the analysis were ranked according to their influence on both the outputs, settlement, and lateral displacement, in descending order of their influence. The analysis of variance revealed significant cross interactions between Poisson’s ratio and cohesion for both outcomes having a <i>p</i>-value of 0.091 and 0.059. Surface response curves of different significant cross interactions were also obtained to visualize the combined impact of parameters on the outputs. Furthermore, the numerical approach was validated using the well-documented MIT-MDPW embankment case, enhancing the robustness of the findings. This investigation highlights the importance of Taguchi method in providing optimum and worst combination of parameters for the desired outcomes and delivering a robust framework to address long term stability challenges in soft soil deposits pertaining to coastal areas.</p>