Since your goal is to get the bars higher, leave the fork alone, and consider one of the marketed solutions for that. There are a number of options for raising bars and the best specific answer depends on whether you have a threaded/quill stem system, or a threadless one.
Search for things like "stem riser" or "how to get handlebars higher" and review the options suited to your style of bike, and of course, your budget.
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