I'd think about the specific games you play a lot. If it's new AAA projects that are demanding on the hardware, you'll definitely notice a boost in frame stability. But if you're mostly into indie games, strategy games, or older titles, you probably won't feel much difference. Three years isn't that long for a console - a regular PS5 is still working pretty well.
The main thing I'd pay attention to is whether you just need to give your console a proper cleaning and maybe replace the thermal paste if you haven't done that yet. Sometimes that helps a ton with overheating and lag. I remember looking at my neighbor's console once - there was so much dust in there, she was shocked it even worked. After cleaning it, it even got quieter.
If you're still ready to spend the money, then the Pro makes sense, but not as an urgent purchase. It's more of a "I want the best thing available right now" kind of deal - and even then, there's no guarantee you'll actually notice the difference in your specific games.