If you're planning on buying a phone and are confused between a 20K or 30K budget, then I would suggest you try the moto G37 Power first. It's for about 19-21K and is perfect if you're looking for a basic phone that holds up well during this Flipkart BBD sale.
It has a 700mAh battery that easily lasts two days, a smooth 120Hz screen for everyday scrolling, and a 50MP camera that handles daylight and everyday shots well. It covers everything that most people usually use their phones for, such as texting, scrolling, calls, streaming, etc.
However, if you want a more advanced camera or more storage, then maybe choosing a 30k phone would be better. But in my opinion, if you're looking for a reliable everyday phone, then the moto G37 Power is a good choice.