The Idea of being pro Is a wide concept for this game doesnt really have a standard
The following are my oppinions (read this its worth it)
Pking: Pks play a big part In being a pro but i dont think slashing your sword for hours near graal city will make you any better at it when a sparer practices moves to kill your average pker with ease
I dont think pking matters and you can even boost easily
Hours: you can afk, i know someone who started in october and now has 1k hours so no
Bk: bk is easy to boost and theirs no skill involved really just like pking
Spar: sparers seem to show alot but then theirs the negative or positive thing and some people just spar noobs so they can be all positive and brag about it so ya spar sometimes but not always
To me its your sucesse's in the game that give you the title pro and your wisdom
Sucesses like: participate in a gst, take a tower solo
Get a 1k guild,5k or 10k or win a gst.
Also help players around be kind and not cocky and you should know basics on graal history like: Graal was NOT made in 2009