A friend of mine has had ALLOT of trouble with this!
His interests would peak with a gun and he would bury himself into what he likes, then life would get busy, and he wouldnt do the thing he liked for awhile. When he could find the extra time again, he would sell off everything at a great loss, just so he could bury himself into a different hobby. This kind of routine has happened at least a dozen times since I met him. He would eventually get back into guns and complain about how he wished he had what he had before.
I told him to stop selling off “EVERYTHING” to get into the next hobby. Retain as much as he can, and save for the next project/hobby. Eventually when he makes his rounds again, he will be able to just pick it up where he left off seamlessly.
Since I was 18-20 years old, I made a point of trying various aspects of each hobby I enjoy. For instance, I love conventional jacketed bullet reloading, so bullet casting for pistol and rifle cartridges and alloy testing just fell into place.
I tried long range target shooting, and accumulated accurate rifles in very different range capability.
I got into accurizing hunting rifles, and muzzle loading (in-line, and traditional cap and ball). Pistol caliber carbines are a riot as well.
Now that I am older, I naturally cycle through the different disciplines and fire arms I have enjoyed and it doesn't put much of a strain on my finances.
And when the gun world isnt so shiny and luring, I go golfing or fishing. Keep it fresh, and it is much easier to deal with the lows.