It seems like you’re now having second thoughts about items in your collection that don’t spark as much joy as before, and if you don’t like the feeling of clutter I would definitely consider parting with pieces that you don’t love anymore.
Personally I wear jewelry for myself and I even love wearing them around at home so I can enjoy looking at them, and so that counts as cost per wear for me. I love how jewelry makes me feel when I wear them. Of course dressing up to go out is also way more fun when you have coordinated outfits but what I love about jewelry is that you can wear them anytime and especially in the comfort and safety of your own home.
I don’t know if you foresee going to more events in the future but I think it’s always great to have the classics in case you do, and think about which pieces you love most and which pieces are the most versatile. If a piece is difficult to coordinate with the rest of your collection or outfits and it doesn’t spark immense joy I would let it go, because it probably means you won’t ever wear it. But if a piece is very unique and more difficult to match but you love that piece because it makes you feel amazing when you wear it, I would keep it!
I think the Marie Kondo method is amazing for decluttering; you put out all the pieces in your collection in front of you and you can see which ones you still truly love and which ones you feel just meh about. When they’re all laid out in front of you you can also do a mental coordination to see which pieces go well together with the outfits you wear. At the end of the day material things like jewelry should bring you joy, not burden and stress so I think that’s a good starting point when considering which pieces you should keep. You should feel happy about having/wearing them and not “off/out of sorts” like you mentioned. Good luck!!
I’m very bad at Kondo-ing! I get overwhelmed by the big pile of clothes but I think I can do it with jewelry! I've done it with shoes! This is very good advice. Thank you!