@Naresh_Bisht if you would like to try online convenience of optimizing and compressing GLTF / GLB files then check this topic. I would suggest you try KTX2 format, not KTX2e or KTX2u, and GLB-d and/or GLB_m export option. Don’t change the size of your textures initially but can try changing it afterwards.
On the other hand, if you are comfortable with using command line then see this topic.and also search this forum for all other topics that have discussed similar issues.