As a sole proprietor, what does one call themself on business cards, in emails, and on LinkedIn?

Several options I’ve brainstormed:
Head Honcho
Big Cheese
OEO (Only Executive Officer)
The Chief
Sole Priorietor
Owner
(Online Presence) Consultant
President
(Managing) Director
Founder
El Jefe
Care to weigh in? Any others you’d like to add? Which are your favorites?
P.S. Don’t worry, I’m only kidding about some of those

That is always a tough one. You also need to think about your long term goals for the business. If you plan to stay a one person shop, then something like CEO may be a little pompous. Also, when I determined my title, it sounds professional, but I also say that it was a business I started.
Definitely agree on some of them sounding pompous! What do you call yourself? I like the idea of using my title to be descriptive (like Online Presence Consultant) since my business name doesn’t say what I do…something to ponder
I think I’ve seen: founder, owner, and president the most … When I hear the title “CEO” I tend to think major corporation…
Congrats again Cristina!!
I like ‘Founder of _____”. That’s why I put! Founder of G-Free Laura.