I didn't take geography a level but the way i structured it to be specifically what i was applying for may be helpful:
Para 1: I started with where i found my passion for the subject from and how i developed it in my personal time, I'm studying media so i wrote about how that passion began (for geography you could go the route of saying you've always been fascinated with the natural beauty of landscapes and the intricacy of nature and therefore it became a passion and interest) and how i further progress this in my own time through research
Para 2: I wrote about how each of my a levels gave me relevant skills to the subject (mine were politics and german which enhanced my media literacy and communication skills) as well as how studying media at gcse and a level further advanced my passion, knowledge, and applicable skills, if you take any science subjects at a level they would be especially applicable
Para 3: I talked about anything outside of education I had done such as work experience and anything else i had done in school that provided relevant skills and knowledge (for me it was being on the student council but it could also be club or achievement related like dofe), even if you haven't done anything like work experience yet you could definitely say anything you may have lined up in the future
Conclusion: basically just summed up how each of the things in each paragraph provided relevant and applicable skills and knowledge to the degree
this may not be helpful for your specific degree especially as i don't know what kinds of clubs or spare time things you may have done to do with geography or your other subjects but i hope the structure may help guide you somewhat in a good direction, my personal statement was accepted on the first draft so i hope this did help 😅