Finally there are one more person reply my email.
Kyle, an UAL career centre staff, gave me some advices. He shared with me a workshop slides which help student set up an account on LinkedIn. He also recommend me two links which is about how to manage IG portfolio.
From my own view, LinkedIn is different from other social media platforms. LinkedIn is more professional and is mainly for find a job. However, IG needs you to show your own characteristics and personality.
Through the slides Kyle shared with me, I found the linkInIn learning platform, which is free for students. I searched a bit and found a course on personal branding. This may be useful and relevant information for my project, and Chelsea Krost (the teacher of this course) might be my potential dragon.