@Yogita-Chawdhary, you have reached the top of the present plateau. Your work shows that you are capable of so much more.
Regarding contrasts, there are three axes: hue, Chroma, and Value. The value axis is the foundation, and I see a concentration of midtones that generally paint the entire composition. This is only true for some of your examples, but it scatters the focus. Try creating simple, distinct regions of light/dark. Get back across the room and see what I mean. Much of your color is saturated. You are not exploiting chroma contrasts where pure colors are offset with neutrals or low chroma areas. White is the freshest neutral you can employ; it brings a crisp, light relief from concentrated areas of color.
You are ready to take your art to the next level. I encourage you to explore new techniques and styles. Here is an artist whose work, similar to yours, showcases a sophisticated refinement and sensitivity of color choices that may inspire you: https://catagencyinc.com/lavanya-naidu