I think trimming is the key. It allows the slower-growing hairs to catch up to the faster-growing hairs.
And, of course, good care so that you're not causing breakage and you don't need to have much cut off with a trim. I went one full year without trimming just to see how much faster my hair grew, and the damage traveled so far up that I had more hair than usual cut off the following year to make up for it. It's regular trimming for me from now on! I'd much rather lose 1/2 inch per trim than go a year, grow 7 thin inches, and have to cut 10 inches the following year to catch up with the damage. My hair just loves to split! And those splits love to get wider and wider and wider!
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