but I refuse to buy any higher than $400... however long I have to wait
Ambitious target you set there. Way too ambitious, I believe. Time will tell.
How about a compromise? Like you seem pretty confident that we are going down. Then you at least guess a
range for your bottom as opposed to a single number. And spread your buy orders in that range. So in your worst case scenario at least you end up hodling SOME coins. As opposed to seeing the train come closer and go away again.