Even if it is in top 10 coins then too i will not recommend you to do investment i just 1 project . It is very risky because market changes very fast in crypto space . you can see yourself that many coin those were listed on coinmarketcap 2-3 years back are dead . also never hold any coin for infinite period , book profit and invest in other . so invest your money in different projects so that if any of those dip then you face no huge loss .