Hey Deep, I think you are pretty much spot on you need to just really focus on this area of your game and get opponents to mix up thier serves and do the ones you find difficult. You’ll soon ve making better decisions and getting more confident to play a positive return even on the serves you find hard.
Whats important when returning is to be decisive, so like you said on the pure backspin serves you make a quick decision to play a positive open up, you need to work on making the correct decision of the shot to play and being positive against the side spin and other serves.
Normally if you can add plenty of topspin on your return shot this can help neutralise the spin from the serve in a way, so try to brush the ball well and get a good contact on the ball. Let us know how you get on! ?
