As there is no Snapchat premium app (https://allinsider.net/snapchat-premium/) in the playstore, you can easily upgrade your Snapchat into Snapchat plus. A premium Snapchat account lets you earn money by sharing exclusive content to other Snapchat users who follow the premium Snapchat account holder. If you want to create a premium Snapchat account, then follow these steps:-
1. Go to your Snapchat profile.
2. There you will see the Snapchat+ option, tap on it.
3. Pay the monthly subscription and your 7 day free trial will get started.