It’s worth practicing! I bet it’s not too hard to get reasonably fast in a few weeks. The hardest part will be un-learning any bad habits, but if you reckon you’re currently slow, you probably don’t have too many.

I've been typing with the same speed for the last 30 years. It is not improving so I really doubt special exercise will do anything but marginal improvement.

Don't practice typing faster with your current method, because you already have for 30 years. Rather invest some time to learn a better method.

I learned touch typing within a week on holiday vacation with a software similar to this website: https://www.typingstudy.com/ (Young me felt very proud of being able to type like dad.) Once you have invested the time to learn the basic movements, you will become accustomed to them naturally.

You would be surprised by hovering your fingers over home row how naturally quickly you will start typing.

Take the time to learn, it is absolutely worth it. Do not pay attention to the comments saying "you will be at some speed soon" as that's not your aim. Learn to type precisely with as little errors. It will take you several months to just learn the keys. That's fine, it's like coding, learning the slow and hard way, you are in it for the long game. Good luck!

It's worth learning and really doesn't take that much time to get to a decent wpm.

It makes it way easier to communicate via text.