My biggest mistake in crypto is that I did not start crypto before, but came to crypto only in the fall of 2017, if I had come earlier, it would have brought me a lot of profit.
That can't be helped since all of us begin with that kind of mindset in cryptocurrency, we doubted it in the first time we know about it, we thought that it is just a scam, and just a waste of time, but it is not. So we cannot call it a mistake, the right term would be "hesitation". We hesitated on that moment, even though we shouldn't have done that, but what matters is that we are here, earning cryptocurrency.