Might be worth trimming the plant back a bit after transplanting so its not having to try and feed so many leaves. This should also end up with more bushy growth in the long run. Also, get yourself a spray bottle, fill with water and give it a mist spray couple of times a day. It would have been raised in a greenhouse I'm betting, and depending on how dry/ humid your room is, that may be affecting it.
Basil can be fussy, but they sort of come and go, healthy to not looking well, then back again.
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