I think there is no bad time to build a crypto porfloio. What's stopping you?
Now the market is in stagnation, everything has fallen in price, it is possible that it will fall even more, but many coins fell by 30-50% from previous positions, and by 40-60 from ATX. This means that you can easily make money from the current ones.
I can confirm that what can stop a person from building his or her crypto portfolio is doubt, and indifference !! even though if we pay attention this is the right time to do it because cryptocurrency will be more noticed or favored by many people for the future