The problem is that most of the drivers are too pointy, and the screws arw nowhere near as deep. If you take some fine sand paper and sand or file the tip flat so that when you look at the end of the bit under a light you’ll see a “Y” shape that’s rather thick or “bold”, instead of a sharp point, or a very thin “Y” shape that’s not well defined.
Remember though, don’t keep trying bits that don’t grab right away. every attempt that fails to turn it will take a little more metal from the screw.
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UPDATE: after finally finding a proper Y000 driver at a local electronics store I was able to complete a repair on an Apple Watch series 3. While I did have some success filing down a cheap tri-wing driver until it fit the screws, there was one screw that it wouldn't loosen. The bottom line is this:
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# Get a proper Y000 driver, don't use Y00 as someone suggested. Don't use hot glue. Rubber bands do sometimes work but they won't in this case because the screw is too small and the driver will poke right through the rubber band with the application of any pressure.
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# This is one of those things that requires a little bit of money to be spent because the tool manufacturing process and material used both need to be top-notch.
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# If the tool is advertised as one that's made for Apple products then it's probably going to work fine provided it's from a reputable tool maker.
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# If you keep trying to drive a Y000 screw with a tool that doesn't grab well you'll strip the top of the screw and then you'll need to find a way to make a straight groove in the top which will allow you to remove the screw with a tiny slotted driver (flat head). There are a ton of problems that can arise as a result of this. Metal flakes can get lodged in between surface-mount components and do more damage to the device. Also you could slip and cause more damage. Etc.
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The best way is almost always the originally intended way. (Except when the originally intended way is to pay Apple to fix it.) Good luck.
The problem is that most of the drivers are too pointy, and the screws arw nowhere near as deep. If you take some fine sand paper and sand or file the tip flat so that when you look at the end of the bit under a light you’ll see a “Y” shape that’s rather thick or “bold”, instead of a sharp point, or a very thin “Y” shape that’s not well defined.
Remember though, don’t keep trying bits that don’t grab right away. every attempt that fails to turn it will take a little more metal from the screw.