...this MarketWatch article says there are three ways to "undo" it:
1: Withdraw your claim, and start over: Only works during the first 12 months.
2: Get a job, get an Adjustment to the Reduction Factor (ARF): Go back to w*rk if you are under 66 and get a SS increase when you reach FRA.
3: Suspend your payments, get a raise: Suspend your payments between 66 and 70 to earn an 8% annual increase.
Took Social Security too early? Undo it! - MarketWatch
I was aware of 1 and 2, but not #3. Although I started SS at 62 and hit 66 tomorrow, I think I'll pass.