I've sold most of my gear over the last year or two, and at this point, I'm not really regretting it.
I had an on-again off-again love-hate relationship with Eurorack, but now that it's all gone, I don't find myself missing my system. I realize this may put me in a minority here, but I never found myself doing much with the euro system that I couldn't do with other gear I had.
That being said, I'm almost entirely without synths now, except for a DSI mopho x4 I'm trying to part with and, of course, all my software synths. But I'm really enjoying not having all the clutter and thus not being overwhelmed with choice.
I've found myself returning to my roots with guitar, particularly acoustic guitar, but combining it with what I've learned over the years in computer processing. It's all somewhat simpler while leading to more pleasing or successful results, as far as I can tell at least.
I remember a time I had little or no lust for additional gear. And I'm reengaging with that time and feeling now. I find my laptop (and admittedly the vast amount of tools that comes with), a microphone, and acoustic sound-emitters (whatever those may be) to be sufficient for composing.
Of course I miss using some gear: my old ciat lonbarde cocoquantus, sidrax and plumbutter; some euro modules; a Sherman filter. But I don't miss any of it more than I enjoy the simplicity of my "studio" (i.e. a small desk and several guitars in my closet).
That's my two cents.