According to the Paris Songfacts, this song is about Nash's journey over the past year and the pressures of what people expect from her. It's also about arguing with people that you're close to, and then when you're arguing with someone else, using their opinions.
You've come so far, well done, darling
We knew that you had it in you
You can do anything that you want
World is an oyster, don't disappoint us, ta