if there is a dump price to $1000, then i think you need to wait for a while and make sure the price is really get down. but if you want to buy bitcoin without considering with the dump, i think you can buy right now and i think even if there is any dump happen, the price will be back to the right price soon. to anticipate you got loss, you can do trading altcoin so you can increase your bitcoin amount and in the end, your money can be back to the first time you bought bitcoin. i already try this and i am lucky to get my money back so i advice you to do the same with me.