You got great growth...If you are worried about breakage...its not like relaxing will cure the breakage...
You need to treat the problem...backtrack and treat the breakage first, see how you fare, and if you still want to relax, then relax it....Most people who relax after trying the natural thing to me, haven't really achieved the hair HEALTH their natural hair requires....
Its not that being natural is hurting their hair, it still comes down to your hair care practices.....For example....if you relax, and still get breakage, will you BC and go natural????
Then you are just going back and forth...Nothing worth having is easy, and you will not give your hair its chance to reach its fullest potential as a natural by quitting prematurely...All the naturals who have apparantly good looking and LONG hair are constantly working on it (and relaxed heads with amazing lengths)......Give your hair time...My hair works fine 80-85% of the time...but I still have little flurries of hair popping off here and there and so what? My hair looks great...its growing at its own pace, and I listen to what it needs and adjust or tweak my regimen to stop the breakage........
Give it time...but if you quit...you don't get to run your victory lap!