We're sorry this happened to you, contact Splice to see what options they have for you.
If you're going to attempt file recovery on your own having done this many times myself, File recovery programs like DiskDrill can help, using a drive recovery service is also an option, it all depends on how much is your data worth to you?
You may find that the file names may not be recovered, file recovery programs most often will recover files as File001.wav, File002.wav and so on. If you have large sessions, putting it all back together may not be possible especially if you deleted the session files that recorded all the automation and edit changes.
Common practice that I've seen in small to large studios is to buy a dedicated drive for your audio. When the project is done, pull the drive, label it and put it on a shelf for when you need it again. Go buy another drive for your next big project. YouTubers do this as well. If you can afford a drive array to store your data for quick access, that's something to consider.
Back up your Back ups from time to time, digital media is not forever. Storage is cheaper now than ever.