The Death Spiral suggests that as miners quit, the network becomes slower and less secure, causing a total collapse. This fails because of Bitcoin's Difficulty Adjustment and can be answered every 2,016 blocks (roughly every two weeks), Bitcoin automatically adjusts how hard it is to mine based on the current hashrate. If hashrate drops, mining becomes easier and more profitable for the remaining players, which inevitably draws miners back into the market.
Firstly people must understand that the Bitcoin blockchain difficulty will be adjusted every 2,016 blocks and with an average block time of Bitcoin is 10 minutes, it takes about 2 weeks for each difficulty adjustment.
Secondly, after understand the concept, they can use this website and perhaps other sites for getting Bitcoin Difficulty Adjustment Estimator.
https://newhedge.io/bitcoin/difficulty-estimatorThe current estimations
Next difficulty change: between
-8.5786% and
-8.1479%