Bitcoin needs to find support in the $90,000 to $85,000 range for altcoins to recover.Bitcoin (BTC) started the last week of the year with a soft note, indicating a lack of urgency from bulls.Analysts are divided on Bitcoin's short-term price action, with some expecting a strong rally leading into the inauguration of Donald Trump.MicroStrategy continues its Bitcoin buying spree, purchasing 2,138 Bitcoin between Dec. 23 and Dec. 29.