I myself do not think too much about whether the coin I bought must be included in 100 CMC, because in my opinion it does not guarantee us in getting a profit, I prefer to buy coins which I think are good in terms of projects and usability
Of course all depends on our investment goals, if for the long term, buying top 10 in coinmarketcap is a good and safe thing, but in the long run, buying not top 100 is too risky.