Hi Nivas,
The key thing is to try and practice against these types of serves as much as possible. Watch this video: https://tabletennisdailyacademy.com/videos/return-tricky-long-sidespin-serves/ it goes over exactly what you need to do and how to return these fast serves that land on the base line.
When the ball goes short here is a great video which covers the return of these serves to: https://tabletennisdailyacademy.com/videos/returning-short-heavy-sidespin-serves/
If you could send us in a video of you returning these serves that would be of fantastic help for me and Tom to provide you with feedback 🙂
Hope the videos help.
Dan 🙂