Social Security Benefit Estimates

Can I Accurately Calculate My Age 70 Rate By Increasing My "Take Now" Rate By 8% Per Year?

Hello again Larry,
Thanks for the good info on WEP and UK state pension. I have just checked my SS online account and see that my estimated benefit at 70 has reduced by about 500USD a month. Also that my "take now" benefit only went up 4% for last year (62 to 63). I am thinking this because I have not had any earnings since retiring at 60? If this is the case can I expect further reductions on potential benefits and/or would it be accurate to say I can calculate an 8% increase per year on my "take now" amount even if I do not have any earnings in the future.