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You want to raise the stem, but it's been cut? How many spacers are under the stem now?

There's a limit of how high you should go.

Most forks with carbon steerer tubes recommend 40mm or less of spacers (and a some are 30 mm or less). Each standard spacer is 10mm high. There are 5mm or smaller spacers for fine tuning the height.
 

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A higher bar should be fine. But you probably don't want it to be really close to the steerer. As the stem angle increases, the bar position moves toward the back of the bike. Bikes with very short stems, like a 60mm, handle differently than normal stems.

What stem do you have?

I'm guessing you have a 100 mm stem with about a 7 degree upward angle. The stem should have the size and angle printed on it, or you can measure the length (center-to-center) with a ruler and estimate the angle. (I google "7 degree angle" and view the Image Search.)

But it could be a zero angle (90 degree) stem, or maybe it's still flipped down, at a negative angle?


Comparing to a new stem
See this Stem Comparison Tool

And as the bars are raised, your body sits more upright. So that increases the upright effect you are looking for.

For example, compare a 100 mm stem with a +7 degree angle,
to a 100 mm stem with a +30 degree angle.
That moves the bars up 33 mm, and inward 23 mm.
 
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