We saw strong buy volume over the past few days fueled by mainstream news (ETF , Coinbase etc), pushing the price up from 6k to 8.5k. However, the overall Crypto market cap did not increase significantly, the rise of BTC was fueled by the sell off of ALTS. This scenario is very similar to last year when BTC Futures was launched.
8.5k region is a very strong resistance zone and would need HUGE buy volume to break it. This resistance zone also coincides with 200MA and 0.618 fib.
Personally I feel that BTC have to capitulate before we will reach new ATH, the old money needs to change hands with the new.
A good way to enter would be to stagger your buys at 3K - 5K region, it is impossible to time the market or buying at the lowest, you will end up with a lot of miss opportunities. Most importantly, have a framework and stick to it, trading crypto requires a strong mental.
This is just my personal opinion of the BTC market, pls do your own homework and invest cautiously