Sorry but it's the usual answer: practice.
Provided you have technique correct - good position, good fingernail length and condition, using the correct fingers in the right order - then you just need to start at whatever speed you can do it right, and in time, even if it seems painfully slow. Keep the timing steady and the dynamics even (hearing each note clearly).
Of course, if you identify a specific weakness, work out an exercise to concentrate on that. (Often, IME, it's irregular timing, or uneven dynamics, which can be caused by incorrect hand position, or simply having my fingernails the wrong length.)
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"There is a crack in everything. That's how the light gets in." - Leonard Cohen.
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