I'm sad to say that Switch Vault closed its doors on Friday April 3rd, 2020. This was a hard decision. I loved Switchlist just as much as you, with it's wishlist and collection analytics, lists and release calendar. Unfortunately I found I had increasingly less time to work on Switch Vault. I also found that other than the above mentioned features, there aren't many features that aren't already covered by the eShop and Deku Deals.
Because of this, I turned off Switch Vault so that I could refocus my efforts on other projects that need my attention.
My recommendations for a replacement:
Thanks for all your support through the good times and bad even though it was only a few short months. I'll still be hanging out in the SwitchRPG Discord channel. Come say hi!
See you around,