If it doesn't bother you in its natural state you could just leave it as is and let it keep growing. If you think it could be damage, have you tried microtrimming? Hemlines can sometimes look a lot fuller with not much trimmed off.
If this has happened before and it's happening again after chopping back a lot, then I would not chop back again. Unless you know why this is happening, taking the same action may lead to the same result only you'll have lost whatever time it takes you to get back to this point again.
Edit: A lot of S&Ding can make ends look thinner because you're basically doing a selective trim which thins out the ends. This is also something that microtrimming might be able to help with. If you're needing to cut out a lot of ends with S&D you may also want to look into how to prevent the splits and damage that are happening so that you don't need to S&D quite as aggressively.
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