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that said..
IF...I felt a wild urge to diversify..
what do you think of Ethereum, LiteCoin, in addittion to Steem and Bitcoin?

I'm on 4 coins top heavy right now: Steem, Bitcoin, Golem and Ethereum :)

is it worth while?
Golem is different from Golos?
can I change bitcoin to either of them on Bittrex?

Golem is different from Golos?

VERY DIFFERENT! Golos is a the Russian version of Steemit, and Golem is the new supercomputer on the blockchain! You can buy Golem on these markets:
https://coinmarketcap.com/assets/golem-network-tokens/#markets