There is no year that is the best to get into crypto currency, there is no indication for the right time to buy or sell, everyone just do at their time when the feel they have make enough profits or cut their losses.
indeed I also feel that there is no best year in crypto, because not everyone feels the same thing at one time, in crypto there is only the right time to take advantage of opportunities so that they can make a profit from the investment made, and each person is different in determining the right time