WD external hard drive could not be mounted

Hello everyone,
I have a 1TB Western Digital Elements external hard drive, that in the past I had to remove from it's case and use with a SATA cable, because it wasn't getting enough power.
When connecting it like this to my 2012 MacBook Pro I had no issues.
I moved around a lot for a period of time, so it too moved around with me, but I always stored it carefully in my luggage. What I'm getting to is, when I finally settled down, I tried accessing my files and all I got was an initial "wirr" from the drive and then nothing. It won't show up in Finder, but I can see it in Disk Utility. The little light where the power connects turns on and I can feel it working when I touch it.
If I try to mount it though, I get ''The disk “Elements” could not be mounted. Try running First Aid on the disk and then retry mounting.", but First Aid has it's options disabled.
Is there any way I can rescue my data?
Thank you,
Nicole

To anyone who has the same question:
As it seems there's nothing else that can be done but to use a file recovery program such as FileSalvage. I got everything back

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