I am a buy and HODL. I dont go all in at once but do add as fiat allows me to. I do cost average. My STEEM purchases range from $.80 to $1.30 with one batch at $2.
My BTS ranges from $.05 to $.30.
I did that with my holdings in LTC, BTC, and ETH although I lightened up on those three a while back.
That is just my approach....I guess need to have a long term optimistic outlook about cryptocurrency and the blockchains buying into.