Well, first of all, it is possible to self induce some level of sociopathy. I did that. Psychopathy is smth you're born with so purposfully induced psychopathy would sociopathy. You also need to be sure before you do this, I don't know for sure if this is reverisible because I haven't tried it.
I'm also not sure if just anyone can do it. I have a sample size of one, being me. I told myself I'm better off without feelings, better to never feel for humans. Told myself to be better, wanted to be better than what I was.
I recall the first step I took was being ready to be abandoned, expecting the worst from everyone, so I would be ready when they eventually left.
Then it developed itself further to simply not caring, about anyone, fueled by my growing hatered towards the world and humans. I believe the numbness that comes with depression also affected me.
I nailed in the final nail only recently. Now I truly don't care, I don't need anyone or want anyone's company anymore. I did this by self isolating and just telling myself not to care. Since this is basically the second time I did this, it was a relatively painless and quick process. (Took like a month)
You can, you still can, you just can't love as a human love anymore. People just become entertainment, replaceable. like video games, movies, whatever, but entertainment can still have an impact on ppl. You can still be sad when a game or movie is discontinued, but it just won't hurt too much. You move on and find a replacement.
This is my experience at least.