So 2600 or 2800 seriously is probably to high of a rating to aim for.
How ever I would say that 2000 to 2100 is more likely if you work hard at it, and 2200 to 2400 can even be achiveable, depening on your study skills and disiplince and personal love for the game. It really comes down to how much time to do you want to put into something, to be good at it. Also i would suggest getting a chess coach to help point you in the right direction.
I have heard that you need at least 10,000 hours of work to be good at anything!
10,000 hours is 5 years of work at 8 hours a day, 5 day a week.
You could change things abit and try 10 years at 4 hours a day, 5 days a week.
or 2 hours at 20 years.
Really to be good... really good at anything it takes time, dedication and probably the most important part is to truly love what you do since it takes soooo much time to be an expert in something. If you love what you do then you will have the motivation to succed.
Lol, but how long have youve been playing chess