When I explain something about myself, as you are reading here or on my LinkedIn profile, I use the pronoun “I” to speak of myself.
Not “Marc,” or (heaven forbid!) “Mr. Halpert.”
When I expound on a topic, here or on my LinkedIn profile, that needs clarity and/or involves a procedure, I use smart, business-like verbs, as if I were making a professional presentation. If you need powerful verbs, see a website originally designed for resume-writing, but the piece rings true for LinkedIn profile writing as well.
Not fifth-grade verbs like: had, was, did, made, etc.
Do the math: I + power verbs = self branding, more than the sum of the parts.
