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Fixing all crawl issues should undoubtedly help with SEO "across the board", however it can be unrealistic to expect this to fix the rankings for an unrelated page! Put it this way, if you're page is already ranking 2nd place for your keyword, it already means Google "likes" it. Don't get me wrong fixing site wide on-page technical issues definitely moves the needle, however if no internal links or content really changed then I wouldn't necessarily expect significant SERP movement. Perhaps look to off-site factors e.g. backlinks and domain authority to position number 1 and do a Gap analysis. Kind regards, Nick