My 'trading strategy' has been just one activity, buy.  Is it even trading, possibly not, but my on paper return is very good.  What I have done is found technology strong, community strong cryptos and found them early enough that they are crazy cheap, then helped the project by being a vocal supporter, help getting them listed on exchanges and services and generally telling every one who will listen.  Then all of a sudden they take off and you make a bunch of money.
I have done this with Gridcoin, Solarcoin and Siacoin.  Im still holding them all and mining them all as well which increases my ROI.
Steemit is a bit different, I got in quite early but Im already powering down because of the long withdrawal time.