im sure, if some people sell their coin, it doesnt mean that they are not believe on bitcoin. i think, there are many reason why people sell their coin. maybe they pay debt, or they out of stock money and just depend on bitcoin, so must be sell their coin. and im sure none try to sell coin because of afraid about market cant recover, because someday it will recover again
It has become a stereotype that if people sell their crypto currencies- talking about bitcoin in particular, it means they give up or don't believe. you made a good point that there are many reasons why one would sell. of course their are those that sell out of fear or just over they give up- but that's on them.
Generally people will afraid of their investment when the price is coming continuously down but in the situation the price becoming very stable but the development will be very low and so people selling their cryptocurrency but my opinion is while the prices table it is very healthy for the development so wait for some time to do something better with your knowledge.