Yes and no... Based on what you described in the first couple of posts in this thread. I don't necessarily believe the level of ability you claim to have. Not trying to diminish your enthusiasm. Just rather see you succeed in the most efficient way possible.
Anyone that hasn't lost a limb and played at the level you claim should be able to retain the ability to draw the ball and definitely have proficiency in stop shots. That appears not to be the case, so again, I wonder how adept you truly are.
You've also stated that you never learnt how to play with side english. Becoming proficient in that skill is a corner stone to play. If you haven't gotten that far, then real instruction could be invaluable to you. Could you practice it to death and smell like roses...?..., certainly. Do you have that much time and dedication...?..., can't answer that for you. I'd wager the cost in instruction vs table time to learn that skill might be a wash.
Drills are great, but you need to understand the basics first imo. Can drills explain the physics of what's going on...? They definitely can teach you how to correct for whatever you're doing.
That technique was never good... low hanging fruit to sell swamp land. Attempting to shoot straight back of a distant rail is infinitely better and saves you the cost of the bottle of Coke.
Can't comment... I'm old and know everything already so I won't pony up for lessons or workshops.
This might seem counter intuitive but maybe you should set a goal for future play, rather than simply climbing for an unrealistic plateau. Are you aiming to be the best player in the room...?.., or challenging state wide events..? A whacky stroke can be engrained and overcome, but the odds of extreme high level play with one is unlikely. Regardless, I think based your own statements. I would strongly suggest those 1 or 2 lesson with a reputable instructor.