what if a prolonged bear market ?as not in anywhere in history?

As this is the peculiar case ,assuming that the valuations have been high and mad tariff war may extend , there is a meagre chance of prolonged bear market .
Mass liquidity is the reason behind euphoria market rally from 17000 to 26000 in nifty.

A worst case scenario, may take the bear market to sustain to another 5 year, w.r.t to tariff war and the consequential geopolitical tensions.

Believe this should not happen.

Thanks