You can't time the market. In my opinion, you should do dollar cost averaging in order to get the opportunity to buy some bitcoin. The price of bitcoin is really staying more or less 8,000 USD and the perfect thing to do is to buy bitcoin from at least 20% of your capital and as the bitcoin's price go lower then you should buy more to lower your average purchased price.
Definitely a good decision to buy bitcoin at this price, buying while price less $8k is also good opportunity for us. Indeed we cannot time the price in the market but buying more every its dip could gives us gain profit when it recovers. We may see changes of price so we can wait and purchase btc.
Buy now and for sure you will earn profit for the future, but if you think that the price will go down then it's good to wait and buy at the dip price. If you want a long term investment i suggest you to buy now and wait until the bull run happen.