How long can these ATH'S last before we hit another bear market. Anyone still buying at these high costs? lol 
The answer lies on the market analysis you can check here https://coinmarketcap.com/That Indicates that seemingly the Bullrun is over and now we are facing the another part of trading in crypto and that is a Bearish market.
though we still cannot consider this as Bear market yet seeing Red everywhere is somewhat the same as Bearishness.
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Exactly , But at least OP is asking for opinion , Maybe he is looking for Exit price that's why he is asking constructive opinion here.