Journal theme
The headline and the first three lines of About do most of the work. Start there.
The headline is not a job title
A title tells people where you sit. A headline can tell them what you are known for. Keep it plain and specific rather than clever.
The first three lines
Only the opening of the About section shows before 'see more'. Put your clearest statement there, not a greeting.
Experience entries
Treat each entry as a short account of what you changed, written for a person scrolling on a phone.