Few suggestions regarding your mobile app:
1. Please have a look at Zerodha's kite mobile app. It is the best mobile app in India. It is light weight app in terms of memory consumption. The UI is eye-catching, and the most intuitive trading app. You can also take inspiration from SAS alpha mobile app. That is also good in terms of UI/UX.
2. Adding scrips should be easy like zerodha kite. This is very important. Adding scrips in fyers web or mobile platform is currently a nightmare. Especially when adding options contract/currency options contact.
3. Should have fingerprint/pin support.