Well, in that case. Good time to buy calls on BTC and ETH right now? May be long term since BTC is at 8.5k right now, I believe that one BTC bull run will easily take it over 9k.
I wont give financial advise. So treat my words with a pinch of salt. This is what I would do.
You can buy at this point but the trend is slightly bearish right now. We might see 7k USD or even less in the worst case scenario. With this market trend you would be better off dividing the capital into two parts of 2:1 ratio the 2/3rd of it should be given to buy at this price and the rest 1/3rd kept to buy in case it dips even lower. After that you would be out of cash unless you want to approach this in a different strategy.
Sell these lots at a specific stop/losses that you wish to be in when the bullish trend takes over.