The basis of monetization is a subscription. The subscription provides access to all meditation content. Additionally, the subscription expands the player's capabilities on every screen of the application.
With an active subscription, progress in the meta becomes faster: double rewards, more gems, more loot boxes.
Plus, there will be in-app purchases for metagame features. For example, some special items which will increase avatars efficiency. Or it might be ability to save users perfect track if he occasionally skipped couple of days.