An older version of your life can be cherished without being restored.

Fondness for a past chapter often converts itself into a plan to bring it back, and the reconstruction almost never works, because what made it good included particular people, a particular timing, and a version of you that has since moved. Keeping something does not require rebuilding it.

Let a good period be finished and valuable at the same time. Take one element that still fits your current life, a walk, a meal, one friendship, and keep that. Leave the rest where it worked.