In addition to what @Nived_Nambiar suggested, have you also tried testing this with different parameters of the OCR engine? There are usually text height and width multipliers that you may need to experiment with to find the best match that works with the specific font on the page.
Also, if this is in a web page, it might make more sense to try to use Browser automation actions and click on an element with a custom selector, or use JavaScript, instead of OCR. OCR is always quite fragile and not very robust.
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