Yes, its always good to diversify the investments and minimize risks. Sub is definitely going to moon and is a long term hold token. What I like about Sub is its price movement and consistency. The Cryptopay feature and the incentive of running Sub node with 'Long term hold' and 'Quantity of Coins owned' will ensure the consistent price increase.

Steem is still a good buy at this point and will continue to rise in value given it's use case.