Google's John Mueller said in the pas that crawl frequency and ranking higher are not directly related and you can rank high without a high crawl frequency.
John Mueller said it another way yesterday on Twitter basically saying that if you site sees a low crawl rate, it isn't necessarily a bad thing. John wrote "that's not necessarily a bad thing." "Some sites just don't change a lot, some are just less interesting, every site's different," he added.
Here is his tweet, when someone asked why his site isn't crawled ten times more often:
That's not necessarily a bad thing; some sites just don't change a lot, some are just less interesting, every site's different.— John â.o(â§â-½â¦)o.â (@JohnMu) June 5, 2017
Forum discussion at Twitter.