I am sure that Bitcoin could reach ATH again this year, but it will be difficult because Bitcoin need to settle down the transaction cost and bring back the investors, alt coin also being the target of investors to diversify their investment, but the potential of Bitcoin growth is still big
Im not sure, we saw an all time high of almost 20k not too long ago with slow transactions and high fees,
although december was mostly FOMO i think, people were getting in because they couldnt see the fall only the continuing rise.
That ciuld gappen again quite easily.