spr3 is telling you to get an in-person coach because you need to get some fundamentals in line.
To me, it looks like you're really holding on to the ball, which causes all sorts of issues, including a "roundhouse" style of delivery - it should be a nice straight swing. This allows you to aim MUCH better - with a roundhouse, you have to let go at EXACTLY the right moment or it's completely off. With a straight pendulum swing, it will always be (mostly) on the right target line. . .
At this point, I would REALLY suggest getting your fundamentals down before trying a 2-finger, no-thumb method. You might get some hook, but you will still lack consistency.
Think of it as getting a new, bigger engine, while having your wheels of 4 different sizes, the differential messed up, and your transmission running with sawdust in it. A small motor will work JUST FINE if everything else works. . .
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