Gold Price + Currency Converter App - Feedback Pls

Hi, I am Backend Develop I have designed my first app.
Need feedback for improvement. I have referred various apps and reviews and came up with my own. Also, I am very bad with colours.

If anyone would like to install and see then please share me their email id and you can join the beta testing

Available for pre-register on google play store

https://play.google.com/store/apps/details?id=com.irfanbaigse.gold_plus_currency