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Go to the Google Play Store:
https://play.google.com/store?hl=en_US&gl=USClick the 3 lines in the top left corner. Scroll down to “My Subscriptions” and click it. Click the subscription for TiviMate. Then click “Manage”. You can then cancel the yearly if it hasn’t renewed yet. You can then purchase the subscription again but choose the lifetime instead using the TiviMate Companion App:
https://play.google.com/store/apps/details?id=ar.tvplayer.companion&hl=en_US&gl=US
Thank you CBP