Perhaps cost average and stick to the plan? Anything else will drive you batty with doubt or regret. I don't think we're going to be seeing any crazy moves upwards for the foreseeable future. There's still plenty of room below. Whichever direction it takes, those who average will be the least frazzled by the time they're all spent out.
The beauty of cryptocurrencies is that we will never know for sure if next crazy pump won't happen tomorrow. I mean, the recent ATH happened out of the blue.
No one expected that bitcoin will soar so high in December 2017 - people at that time would be totally happy with $10k and we get 2x more.
For now, we are plagued by some random bad news and FUD, but I expect that soon coast will be clear, which should open the door for another price race.