If you've tried PRO and it wasn't for you, you can downgrade to the free plan at any time via your Admin page. Once you downgrade, you will lose access to all your PRO features and you will not be charged again.
Follow these steps to cancel your PRO subscription:
1. Login to your Linktree admin page
2. Click on your profile photo in the bottom left corner
3. Select the 'Billing' option
4. Select the 'Downgrade to Free' option in the 'Your Subscription' section
From there, you can follow the steps to cancelling.