Their is an app from Google where by giving your opinion you can earn Google Play Balance and you can use this Google Play Balance for purchase of Youtube Premium, Can buy Android Apps on Google Play Store, or places where Google Play Balance is accepted. All you need do is just give your opinion in the App.
Earn Google Play Balance
First download the Official Google App Called Google Opinion Rewards from Google Playstore or use below link.
Open the app and you will see Surveys under My Tasks section.
Answer quick surveys and earn Google Play credit with Google Opinion Rewards, this app created by the Google Surveys team.
Mostly based on your Google Search you will get 2-3 Surveys in the app.
And for each Survey Answered you will get from Rs 5 to Rs 20 and it varies based on the location.
Google Opinion Rewards is available in several countries worldwide.