Hi there,
Thanks for reaching out in the Community for help.
This is a question best posed to your accountant.
According to this article on Understanding Asset Valuation, "[a]ny land your business owns is recorded at historical cost. Because land usually has an unlimited useful life, generally accepted accounting standards mandate that land is never depreciated. It’s also never written up, even if its fair market value increases."
The best course of action for you will be to consult your accountant for the best way to reflect a write-up for your land asset, if this is what's recommended. If you're not already connected to an accountant, you can find one in your area here: Find a ProAdvisor. ProAdvisors are certified accountants who are also trained in QuickBooks Online, so consulting one will help you with this question.
Let me know if you have any other questions.
Have a great day.