You are not a professional unless you gamble professionally for a living like poker players. That is the only thing. You can act professionally, but that is something else and you would just be considered a disciplined amateur. To act professionally you need to check all the boxes like discipline, strategy, bankroll management and such things. If you miss on any of them then you aren't really good at this.
Theres a point right here because even into different aspect of field I guess you cannot called as a professional once you didn't prove anything at all you must need to showcase your skills, and knowledge which you can be called as a professional for a casual play I guess you are skilled which is the possible proper term to called with this as long as you didn't show up into a professional tournament to get well known by the people professional are right there title only.