What should I do with units after I've got the TMR?

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I have a number of units which I don't really use, but have got the Trust Master Reward (TMR) already. I've since got more duplicates of the unit.
It makes sense to me to start working on a new TMR for the new unit, to use the duplicates.
However, what should I do with the unit with 100% TMR which I don't use?
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