Your selections are good, that is also in my direction but not as many as yours, if you need to add more then do research on the first set of coins on coinmarketcap but I really do not like holding too many coin, so as to be able to follow updates about them, also to know when to even add more or sell.
Adding the large cap coins thus the top coins on coinmarketcap is a good strategy for ones investment portfolio. However, it is not all the time that the top coins are rising. Sometimes their prices can stay be consistent for a period of time or even drop. Hence, it is always good to also look out for the new coins on the market, do some research into them and know which ones are capable of rising within a particular period of time. Invest in such coins and increase ones profit margin.