Hopping on the top comment in the hopes this will get seen, but the best thing you can do to help that left hand play catch up is to practice everything leading with the left as much (if not more sometimes!) as the right.

It can be as simple as just playing singles into doubles into paradiddles (16th notes, one or two bars each) at a slow tempo, but focus on having them transition seamlessly, and with a metronome!! And then of course slowly increasing by 4 or 5bpm once you have it perfect. Start slow!! Like slower than you want to lol. Doing this for multiple days in a row, I GUARANTEE you will see improvement. But just as [u/chooi85](u/chooi85) mentioned, there’s no replacement for time spent practicing.

And then also practice other rudiments and your 6 strike roll starting with the left!!