Altcoin is just a vague category. The market has changed a lot and we can't just divide it into altcoin and bitcoin as their price movement are getting independent of each other. There always will be a trend but altcoin price are rising and falling depending on what they do and how they perform. So, its better to choose the right coin for you be it bitcoin or any.
Most of us hoping that altcoin will have its good season to start are those who bought last year or the previous years, we now are holding a non worthy coins so we are hoping that season will arrive so we have a chance to see it rise and sell if the timing is good.
I think for now people are investing heaving in bitcoin since it's the most profitable coin so far, of course except BNB who really made a decent increase this year and have its ATH, the rest of the coins are just not doing great so far.