OK, you are not able to use the easiest ways to boost it - they include:
1) Waiting til full retirement age or OLDER, up to age 70, to start collecting at all. ----- You are too late for this.
2) If one did start early (opting for a lower amount in exchange for more months paid), stopping/suspending that benefit once one is of full retirement age (66), until one is 70. ---- Unfortunately, you are too late for this one also. You already collected 8 X 12 = 96 extra payments that you wouldn't have gotten had you delayed til age 70.
Depending on your prior or current marital situation, and how the numbers work, you could also:
1) If you are married, look into whether you are eligible for a more favorable spousal benefit
2) If you WERE married but divorced, and the marriage was at least 10 years, look to see if there is a more favorable divorced spouse benefit you could switch to.
3) If any prior spouse is deceased, and he/she either died when you were married to him/her or after divorce (and you were married at least 10 years), you can get 100% of his/her benefit, if bigger than your own (and switch to it)..
That leaves one rare method left, which won't work for many people, only some people. It may work for you:
*If you don't have 35 years of strong work income, but can work now for 1 or more years, to get closer to 35 years of strong income (upon which you pay SS taxes), you can increase your benefit. The further you are away from 35 strong years of income, the more impact all new years of income will have on your benefit.