The traits you call yours may require particular people around you to appear.

Some of your traits are relational. You are funnier with one person, harder with another, more patient in one setting, and those qualities are not stored in you so much as produced between you and someone else. Lose the person and the trait can genuinely become unavailable rather than merely unused.

If a quality you liked in yourself has gone missing, ask who it used to appear with. That is more useful than trying to summon it alone. And it is a reason to take seriously who you spend your time around, since they are partly determining which version of you exists.