I will assume you are around level 60 give or take 10 levels. Once you level to 99 you'll continue leveling up, the next level will be level 1. If you look at the banner for the website there are bot picture in the bottom left. That it the "All-Star" levels which allows you to continue leveling forever. Once you get to the final "All-Star" the process continues but you keep the same bot logo. I hope that made sense. Also is leveling is going slow try playing a 4 player SD Blitz. That is sure to help you level way faster then if you would in Crossfire. Lastly the only thing your level represents is your overall Lifetime earnings.
But at this point i dislike my stats, because i was never informed of MNC ever going to PC as it was a console thing for xbox so i never had the chance to test anything for the beta. If going over level 99 can reset it i would gladly play the living crap out of the game for that reset.