To provide an answer which would help move you along specifically on the lower stomach pouch issue, we would need to have a much more detailed conversation.
But off the top of my head, on the exercise front, I would ask you if you have ever done the vacuum exercise consistently for at least 6 months? (I thought it was silly for years and didn’t do it but once I started doing a minute a day things have changed a lot down there. Jeff cavalier has a video with all the pointers to keep in mind for proper execution).
On the nutritional front, I would advise you to use an app and track your macros for a while just to get a feel of what it takes to hit your protein requirements and how you could tweak your nutrition to help you reach your goal.
As a south asian male, I used to have a similar issue. My body is built to store body fat exclusively in the belly area. I was underweight for the longest time with skinny arms and legs but always had a bit of a belly. The only thing that worked for me was lifting weights and building muscle. I lost nearly all of my belly fat within two years of doing this and I also have a strong body that is no longer underweight.