Perovskite solar cells (PSCs) are a hot topic in the modern photovoltaic industry, mainly for their low-cost design and outstanding optoelectronic properties. For this study, the proposed structures have built with wide-bandgap CuAgBi2I8 perovskite absorber in combination with four electron transport layers, namely Br16NiPc, MoS2, WS2, and ZnOS, with the hole transport layer of MoO3. The optimization includes a systematic variation of layer thickness, donor density (ND), acceptor density (NA), defect density (Nt), and interface defect density (ID1 and ID2) for finding the optimal value of each material for ensuring performance enhancement. Additionally, the related stability analysis is performed as a function of temperature (T), series resistance (Rs), and shunt resistance (Rsh) to observe the non-ideal and realistic behavior of the proposed PSCs. The post-optimization scenario has revealed the best performance metrics with VOC, JSC, FF, and PCE of 1.4443 V, 18.9105 mA cm-2, 88.25%, and 24.10% for the champion structure of FTO/WS2/CuAgBi2I8/MoO3/Au. Other configurations have also shown the maximized PCE of 23.33% for Br16NiPc, 20.71% for MoS2, and 23.68% for ZnOS configuration, respectively.