Hey! You can easily find good hotels in Phuket and Krabi (Ao Nang side, not Krabi town) in the ₹3-4k range on platforms like WanderOn. WanderOn also offers curated stays with great experiences if you're planning a full trip.
There are great hotels in the ₹3-4k range around Ao Nang in Krabi (avoid Krabi town) and Patong or Kata Beach in Phuket. I booked a cozy beachfront stay last year and combined it with my Spiti Valley adventures—highly recommend! Plan it with WanderOn!!