Has anybody tried staying less available at work for better wlb?

Yes. I keep two different numbers personal and office and same for WhatsApp.
So when on leave or after work, you can't reach me on either call or WhatsApp. This had my boss irritated and she told me thrice to be available on WhatsApp especially. I told her I'm 100% on slack and mails, and my productivity is not hampered. But in vain

So now I purposely do not check office WhatsApp or care less if it is not connected during work hours.