The question is: Do you satisfied with your XB1? Because the things that differentiate PS4 and XB1 are the games, and probably the community.
The PS4 has more variety of games, whether it's Sony exclusive or 3rd party ones. Also, PS4 has much larger community, due to the number of consoles and the presence around the world.
Meanwhile, XB1's main market are the US. Also, there's several exclusive games that are scheduled to be released this year like Sea of Thieves and Crackdown 3.
If you really want to buy a PS4, you could do a trade in on your XB1 for it. And if you want to wait for PS5, then you'll need to wait for 2-3 years more.