Here's one thought from a relatively new cacher: if you're already considering archiving a cache, it might be a good idea to do so IF you live in a cache-rich area, AND it's been out there for a while, AND it's not a particularly clever hide or the culmination of a good puzzle.
I have no hides yet, but am working on a couple of puzzle caches that I hope to place in the next few weeks. Around here a couple of veterans archived a couple of their longtime caches this year, and whatever their reason, I am very grateful to have a couple more (nearby, maintainable for me) possible spots for my cache to land. Pretty much every city park around here has one or more caches already.