I have come to understand that, the reason most people are fearful or skeptical in telling someone when to invest or in what coin to invest is owing to the fact that, no one can fully understand the market and hence wouldn't want to tell someone to invest in a particular coin and the coin will only but dump or worst case scenario, the team exit scam. Nevertheless, if you want to invest and have no idea of the coin to go for, I think it is always better to target the top 10 on coinmarketcap. Secondly, don't rush to follow with coins already pumping, wait for a good entry position mostly when it is dumping just as in the current market condition; in the same way, don't buy all at once, buy in batches or bits, as the market dumps, this will give you a better buying chance to have more bag. This is just my personal opinion and what I have seen most people do.
Yes sticking with the top 10 is a good plan for the start and especially when you are afraid of timing and you can't decide whether it is the right or wrong moment, just don't go all in. Buy a little bit of crypto and observe what happens. Adjust your decisions accordingly as far as you feel comfortable with and add to your portfolio an amount you think is alright.