Has it stopped working? I would be very reluctant to stop a medication that is working well.
It's often very difficult for many Crohn's patients to find a therapy that works well, especially one that works well for a for a period as long as 7 years. So if Humira is still working for you I would say be grateful for your good fortune and stay the course. If it ain't broke don't fix it.
If on the other hand if it has stopped working, that's a different question entirely. In that case your GI is best qualified to guide you in stopping the Humira and finding a suitable replacement to put you back into remission.