“I’m still as far away from being able to do splits than I was last year, of five years ago.”

You are not alone in this. In fact, I know a lot of people who hit flexibility plateaus and never move past them. I suggest taking this a a clue that you need to change your approach.

True, you could just keep doing what you’re doing and not improving. It’s “good enough.” Maybe.

Or you could make some changes to the way you stretch in a trial basis. Make a commitment to do more focused flexibility work for one month and see what happens.