Dollar cost averaging is the best investment advice I think. You can invest it all now, but prices could go lower still and you should be prepared for that. So that's why I would recommend to buy your coins spread out evenly over the course of 2-3 months or so. Personally I think the price is going to surge up very soon, but nobody can say when this will happen. Perhaps this week, or maybe we'll see another dip first next month and then suddenly in January or February a huge spike out of nowhere when the ETF is being officially announced. Who knows it might not even happen at all.. just know the risks don't go all-in and purchase some coins with a cool head once every week or so.