You cannot directly convert Airtel main balance into net balance.
Main balance and net balance are separate wallet types in Airtel.
Main balance is used for calls, SMS, and some services.
Net balance is used for data usage.
To get net balance, recharge with a data pack or internet pack.
Check available data packs in the Airtel Thanks app, Airtel website, or USSD menu.
If you want to use main balance for data, buy a data pack that is charged from your main balance.
For exact options, contact Airtel customer care or use the Airtel Thanks app.