Bull market will be confirmed when Bitcoin has passed previous ATH (20,000+).
Until then, be careful, many expect a bull trap and further downside to new lows.
Brother people have lost more than 80% of values of their portfolios and this little rise in Bitcoin is a small sign of relief for them that the price could be the highest in days to come but I think that since there had been stability in the market value of Bitcoin around $4900, even the current rise in a bullish sign. Bitcoin is digital gold and you can do the market analysis yourself. Experts are calling it the boom.