If the current action and playability of the guitar is good at this time and you are concerned about future adjustments then: it depends on the type of truss rod and the nut used to adjust it. You say you are at the limit of tightening. It may be possible to remove the nut by loosening it all the way (loosen or remove strings first). Then insert a washer or two adding more "pull" to the nut. I would also lubricate the threads and nut at this time. Attach the nut again and tighten to achieve appropriate neck relief and tune up the strings. Then if or when you need to adjust the neck relief again you have some room to do so.
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