I'll share the options on how you can sign back in to your QBSE account in Google Play, @Ltabor.
When you cancel your Google subscription, you still have access to your account until the next billing cycle. It could be the remaining time on your subscription has expired. This maybe the reason you're unable to log in to your account.
To help fix this, you'll need to set up the subscription again. Here are the steps:
On your Android phone or tablet, open the Google Play Store.
Find the QuickBooks Self-Employed app.
Click Subscribe and choose a subscription option.
Select a payment method.
If your subscription is still within the billing cycle, you can restore it. Here's how:
Open the Google Play Store.
Check if you’re signed in to the correct Google Account.
We want to ensure you're paying for the two services you’re subscribed to. If you're still unable to log in to your Google account, I'd recommend contacting our Customer Care Team. From there, they can check the status of your subscription and tell you how long you'll have access to it.