I'm bemused by people who scatter their personal details all over social media (for whatever gain they feel they get) which is like throwing fuel on an already burning fire; It'll not go well at some stage, one only needs to investigate how many people are compromised around the world, and to what degree, to know that.
I have to admit, in the past I have freely used my full name everywhere. I rarely give other details (except my birthday). I've started to think using my real name everywhere might not be the best idea. For me, I don't worry as much, but for my children? Might be better to make tracking me at least a little less easy.
I do always use a VPN and I have it set to randomly connect to a different country every time I use it. I'm sure people who really want to can still easily track me, but it's a roadblock to more casual tracking.
But yeah, I kind of assume anyone who really wants to track me or learn anything about me can do so. Nothing is hidden these days. I just hope to make it difficult enough to track me that people who aren't so serious about it give up without really trying.
Full name and DOB? Yeah, I'd be changing that for sure. You know, I don't even use my real name in business. Sure, the company has it, my full details of course, tax file number, address, DOB, drivers license, pretty much everything, but no one knows my real christian name other than HR. I guess I do that as a sort of distractor to those with nefarious intent. It's interesting, I also have friends who don't know my real name.
The VPN is a good idea and I do the same but realistically, there's so many places that have all our details as @jacey.boldart pointed out, that we're at the mercy of them despite our own risk-mitigation strategies.
Here, we had a telco get hacked and thousands had to get new drivers licenses arranged (the company paid). I had a lot of my own stolen as I said, along with many many thousands of others...It makes me wonder about the little strategies we each have in place and why we bother. Of course, like you say, it's best to make it a little difficult, even if it just gives us peace of mind.