This is a small choice of places that might be interesting if you like socializing over drinks outside. Be it from high above the city or on the ground.
These options have at least one of them:
Cocktails with a gorgeous view from above the city across central station. If you like book also a dinner or get a ticket for the Amsterdam Lookout experience, where you can swing over the edge of the building. Hop on a free ferry to get there https://madamamsterdam.nl/
The Amsterdam Sky Lounge is the bar in DoubleTree Hotel by Hilton. Again, here you’ve got a gorgeous view from rooftop terrace, right in the city center. The cocktails are overpriced and not so great (you pay for the view), but they have other drinks there, too. http://www.skyloungeamsterdam.com/en/
Part of Apollo hotel https://www.floor17.nl/
What’s so special? Self-service with a terrace directly next to a canal in the middle of the city. Good choice of drinks on the menu, and some food (Surinaam, Indonesian, Rotis)
The second best cocktail bar I know. (Number 1 is Spice House in Tel Aviv). There is no terrace nor is there a view from above, but the cocktails by Mixologist Lilliyin are hard to resist.