A simple yet very powerful indicator could be the Monthly Stochastic RSI.
We recently had a bullish cross on that indicator. Looking at the previous 2015 bear market, we see that once the Stochastic RSI hit the bottom, a bullish cross-over indicated the end of the bear market and beginning of accumulation/consolidation phase which went on for a few months. Even if this indicator shows a bearish cross again, it will be temporary and the BTC price will just attempt a double bottom at the 3.1k levels (we see almost the exact fractal in the previous bear market)
In summary, I believe there is some good merit that this indicator (Monthly Stoch RSI) actually points to the official end of the bear market.
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