I kept trimming it for the last two years until I had it all relatively healthy and bluntly cut at my chin level (after a hendigo mistake followed by a lot of attempts to bleach that out) and then started to grow it from there. I just couldn't stand the damaged part even though it was significantly longer with it. I think the best idea is to keep it at the shortest length you're comfortable with (for me was at the chin) and keep trimming the damaged bits every month until all of it is healthy and you can grow it safely. I know it feels painfully long, but it's worth it.
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