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    Hmm, perhaps that level shifter isn't able to...

    Hmm, perhaps that level shifter isn't able to drive the opto-coupler LEDs properly - can't see any
    datasheet for it. Opto coupled inputs probably want 15mA or so, which is more than some logic...
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    That's not a small motor. This is the small type...

    That's not a small motor. This is the small type of stepper: https://www.hackster.io/news/drive-a-tiny-stepper-directly-with-arduino-911571f8cd0e

    Try with AccelStepper library and 1000...
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    Indeed you'll never get a stepper to jump to high...

    Indeed you'll never get a stepper to jump to high speed from standstill without speed ramping, unless its a really tiny motor.
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