Put a start point at about $2 two years ago. Put a second point on today's date at about $139.
Draw a simple line beginning at two years ago, including today's point, and extending several years into the future. Though only linear and an approximation, that rough line indicates the gradual incremental growth of BTC wrt USD now and in the near future. Up to 266 or down to 50.25 and everything in between is the result of day traders needing rises and falls to inspire trades where they can earn money.
The demand for BTC is still 50 times the supply. IMO that is one of the fundamental reasons BTC is appreciating along with a gradual increase of companies accepting BTC as payment.
In several years one BTC will be worth over 2,000 USD using gradual incremental increase. That doesn't deny the possibility of spikes to 4,000 USD per coin in bubble(s).