the joy of de-cluttering / thinking about ways to start NEW projects / moving on (gasp) is generally followed up with despair over figuring out money invested vs money obtained from selling off / heartfelt affection for the old models / delusional "i'm sure it'll come back" in terms of game play / etc.
at least for me
denial, anger, bargaining, depression, and acceptance are the five stages
i sold off probably 90% of my comic collection recently. all the "high-end" stuff that wasn't Batman related. All the years of collecting gone, the money, the good times, just having it around, etc. seriously took a while to just get over it and move on
totally get how you feel. for 40k, i played competitively in THIRD edition. been stockpiling since with the delusion that i'll play. i retire next year so we'll see. but until then it's just a massive amount of space and thoughts of time sink / money spent / what's the point / etc. but to unload it all now would be silly were i to actually have time to play once i retire and have to replace it all... but then again, that's why i'm so butt hurt about the firstborn. i have zero primaris. tons of other armies, sure but scale creep, usable models, the list goes on and on...