Just always remember this phrase when you are investing to DO NOT PUT IT ALL IN ONE BASKET or else, you will lose it all in one snap!
It would be great if you will be able to divide your $1000 to different projects like some of the major and some of the altcoins. Try to invest on the top 10 that Coinmarketcap has on its list.

Ofcourse try to put more on the top 1 in the cryptocurrency market which is the BTC! I mean, thats a given, just do not buy when price is pumping or like now that it is on $37,000 as correction might happen soon and may lead to your investment loss. Just watch its price, it recently even go down to $28000, seize that opportunity to buy!

The next one ofcourse is Ethereum, as you can see as days/weeks passed by, its even gaining and gaining even more but like with BTC, buy when it had its correction..

Maybe just do it like 40% BTC, 30% ETH then the other 30% could go on the other alts like $DOT and $KSM