firstly, it's important to note it is very rare that people get off their sections by appealing. simply because if 2 doctors have decided that you need to be admitted to hospital for your safety, then it's going to be hard for you to prove to independent doctors that you don't need to be there.
essentially, to get off section you need to be able to prove that you've made progress (with examples), that you accept your condition and accept that you need treatment. you're obviously unwell at the moment and it's going to be difficult for professionals to feel comfortable discharging you if they believe you're a danger to yourself.
i know it sucks being sectioned, but they are trying to protect your best interests x