Hi ShahezadkhanPat,
I'm sorry to hear you're encountering this issue!
I checked our systems and can confirm that your subscription is still active. However, I want to point out that you should be able to add text boxes without issue whether you're a paying customer or on a trial. This isn't expected behavior, so I'd like to ask a few clarifying questions to help me troubleshoot.
If the issue persists, would you be willing to share a screen recording of what you're seeing? You can upload it here or share it privately in a support case and we'll delete it from our systems once troubleshooting is complete!