As for me, it is just normal that bitcoin has low volume when it is moving sideways but if you observe it when it is increasing then volume increased with it too. Just like happen last year when the end of the year, there is even a bear market first before the bull market happened and along with the price increase, the volume slowly increased as well that caused a parabolic move because of the high demand but then I would still prefer if there is stable movement up instead of sudden movements because its downfall would be big too if ever.