dphatt but I am too old to change.
This right here. Is it worth rebuilding your swing with no guarantee of better play?
It's very likely that ball position is the thing that's been vexing you. If you're playing a lot it's very easy for little changes to ball position or grip to sneak in and cause a series of cascading on-course compensations.
Jack Nicklaus would go back to Jack Grout every year and start from scratch, focusing on the fundamentals before getting into anything else.
https://www.pga.com/story/legendary-basics-from-jack-nicklaus-and-his-pga-professional
"Whether in golf or business, a strong grasp of the fundamentals will set you up for success Jack Nicklaus began every new season with lessons from Mr. Grout beginning with the very basic fundamentals of grip, alignment, stance, and takeaway.
He took a fresh set of lessons every winter to rehash the basics of his game."