Android app enhancements and improvement

I am looking for a skilled developer to help me manage my Google Play subscriptions on a subscription page.

Platform: Flutter

Existing Subscription Page: Yes

Features needed on the subscription page:
Reset purchase properly work(already have in app)
- Cancellation option
- Upgrade/downgrade option
- Turn off/on auto-renewal

Ideal Skills and Experience:
- Strong experience with Flutter development
- Knowledge of Google Play subscriptions and management
- Familiarity with implementing cancellation, upgrade/downgrade, and auto-renewal features