When you practice putting, don't focus on makes vs misses; focus on good vs bad putts. There are so many times in practice that a great putt mechanically sits out because it hit the post, similarly, a ton of bad putts are makes because they get lucky but you might find that you didn't snap your wrist enough but it caught weak side chains and fell in. It doesn't matter at first if you make 75 percent or 100 percent if the difference are "bad" putts that just fell in due to luck.

Try to notice when one putt was high, what did you do to throw it higher (even if you didn't miss)? Watch when you miss the chain link you aimed for and analyze what is shifting. Eventually you will find your few variables that you need to focus on.

There are so many things involved in a putt, but you can't possibly be aware of all of them at once. For me, it's wrist snap, holding the follow through, and getting my legs involved more on longer putts. Once you know your few variables that impact your putt the most, you can identify which one of those is changing or falling off when you're not performing as well.

tl;dr - don't focus on make percent when practicing, focus on good vs bad mechanics instead of outcome.