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Literally just turn faster. Do one-handed drills to get your turning speed up, and also to get the algs in your muscle memory. Assuming you're using your left hand for OH, use your pinky for R/R' moves and your index for U/U' moves, and mostly hold the cube with your thumb and middle finger. (Thumb-and-ring grip is probably fine too, and it lets you use index-middle double flicks for U2. I'm not an OH expert, so I can't tell you which is better.)
As long as you're not reinforcing bad habits, sub-45 shouldn't take very long. Maybe a week or two?
For the most part, don't bother with table abuse. Table abuse for stuff like MU H perm or Z perm is fine, and obviously if you use Roux you can (and probably should) table-abuse LSE too, but in general using the table is a crutch and can prevent you from learning how to handle the cube properly.
"But Max Park does that!" Yeah, and you're not Max Park.