Gatorman
You’ve had some substantial issues that you might have to just work through and hope for the best. You may get some swing speed back as time goes on.
You can go lighter but I’ve seen your swing and it has a nice flow to it. Light shafts may not do a thing for you as it’s a very individual thing, if it works for you.
https://xcalibershafts.com/collections/mystic-series/products/mystic-i6-and-i5-irons
My advice would be try to do a very limited amount of speed training. Just swinging a driver shaft gripped. No head on it. Do NOT overdue it. Maybe 10-15 swings a day starting out. Swing this light shaft and then try your driver.
Measure your swing speed and write down every day.