If you already have an active subscription but you're being shown the Subscription Screen asking you to subscribe again, don't repay or restart your subscription.
Instead, scroll to the bottom of the screen and tap "Restore Purchases." This should restore your access and take you to your Training Dashboard.
One thing to check: this can also happen if you're signed in with a different account than the one you used to subscribe. Make sure you're logged into the correct account, and that you're using the same app store account (Apple or Google) that you subscribed with.
If "Restore Purchases" doesn't work, contact us at support@peakstrength.app and we'll help sort it out.