To be clear, you have a budget of $2000 / month allocated just to paying student loans right? Like you have other money to cover all other living expenses (rent, bills, car, etc)?

Assuming you're not willing to refinance (which can get you a lower rate but will void any federal loan perks like PSLF), your best bet is to follow the debt snowball or debt avalanche methods. Snowball will give you the benefit of knocking out individual loans quicker, but avalanche will ultimately save you more money on interest.

Enter your loans into unbury.us and it will spit out how long it will take you to pay off the loans with either method described above and how much you'll save.