Good day to you, @myselfsiddh-gmai.

I'd be glad to share with you some insights about QuickBooks Online (QBO) subscription.

You'll need to pay the subscription first before you can use your QBO account or avail of our free 30 days trial. Also, if you've avail of our 30 days free trial, you'll have to pay the original price when subscribing.

If you wish to avail of our discounted price for 3 months, you'll need to subscribe to a new QBO subscription. You can also visit our Pricing page to learn more about this.

I've also added this link that you can read for reference in subscribing your account: How to resubscribe or reactivate QuickBooks Online.

Keep me in the loop if you have other concerns or questions managing your subscription. I'll be around to assist you. Stay safe and healthy!