That actually sounds promising! They've said that you may benefit from gender services, which means they haven't completely rejected you as a patient. But they also want you to get treatment for your depression (these are two separate issues), so take your copy of this letter to your GP and ask for a referral to whatever counselling services they've recommended, as well as a medication review.
When that's been arranged, write to the address on the letter, quoting your patient number, and tell them what you've arranged. Show them that you're following their advice & being a good, compliant patient. You've mentioned elsewhere that you've got 12 months before you see them again, so your chances of getting an appointment are much better if they know you're working on the areas they're concerned about. Keep in touch with them every few months so you're at the forefront of their radar.
Many trans people suffer from depression: it's hardly surprising, considering the way we get treated by society. So GICs are used to seeing depressed patients, but they do want us to get a handle on our depression if we can. Many of us feel a lot less depressed once we start gender therapy and start making some progress in that area.