I left one putt short that round. Not bad! All others were just long or in. That's great! Remember, your body is allowed to make mistakes. Billy Casper allowed 7 bad swings per round. That's lots of leeway, depending on your definition of "bad shots." I expect them, so that when they come (and they ALWAYS come), I'm not incredibly surprised or upset. I'm in charge, and while that wasn't a great moment, it was only ONE moment. I'm back in charge of the next shot.
The other thing I noticed had to do with the mental game of noticing thoughts. I realized one putt where doubt/fear/something causing hesitation crept in. It was minor, but I missed that putt. I should have taken another moment or stepped away, telling myself with a solid mental voice, "YOU WILL RULE THIS PUTT!" We, ironically, get scared we'll run it by and THAT IS A MISTAKE! It causes us to make a weak stroke, which will often cause a miss!
Outside of 7 feet (where pros only make 50% of putts), it's time to rewire expectations. I’m guessing you expect make everything. That’s great, if you can hold the expectation lightly. The roller coaster doesn’t help, so my recommendation is this: set your goal to be at worst a tap in coming back at the hole from the low side, having rolled it by on the high side. The high side is the key, as the ball always has a chance to drop in.
The idea is to bring AS STRONG AND REALISTIC as possible, a VISUAL in your mind of the hole. If it’s, say, 30 feet away, try to see it vividly in your mind as you look at your ball. Try visualizing a number of different angles (from behind, same view as when you looked at the hole, with a semi-circle behind the hole, etc., until you find the proper visual that works for you).
I have heard this a thousand times, the idea about this big circle 50 feet away that has a 3-foot radius around the hole. I used this for years, but my putts were often short (I finally realized). Can I be so bold as to propose an amendment? Here's my thought about long putts: Putts over 20 feet should only be 1 foot short but can be up to 3 feet long. You'll always make the comeback putt if you're long so it's really just more of a oblong shape with most of the space represented after the hole. Try this: go hit 10 putts at 30-40 feet. See how long it takes you to develop something of a feel (I bet it's less then 10 minutes) for that putt. You'll be amazed at your skill developed, and you'll have more confidence with the idea that you are now trying to roll putts just by. Lagging may be necessary on slippery putts or super long ones, but just try this. I'm betting on (and toasting to) your success!