Yes bitcoin is back and its raising again. The past values are returning now. This is what you called comeback is real.
maybe traders and investors are back from long holiday vacation if this continue we may see bitcoin price touches to $20k with more people are getting aware of bitcoin price may still surge soon
It is possible that small number of traders was off for the holidays, but i don't think that is all. What is more likely is that most of the traders and some holders wanted to see what will happen with the price and than decide what to do next. So when they have seen that the price is not falling any more, they decided that it is time for buying. Because of that price is on the rise once again.