While I agree with KRSW on going with a known brand when buying new cables, unless your current cable is of significantly poor quality, shouldn’t be an issue with that specifically.
(My go-to brands are now Plugable & Cable Matters, but others are fine too.)

Basic USB-C cables, unless they specify a higher wattage capability, should be capable of 3A @ up to 20V (min also of 480Mbps data speed unless otherwise specified); only if they go above ~4m (up to 10m) can they, per the USB-C specs, be data-only, non-charging cables.

Of course, you could try another cable you know which is capable of at least 60W: a 100W or 240W cable — i.e. both which allow max 5A — would work. If your laptop’s cable is USB-C, you could test with that one.
(If the cable is captive / non-detachable, it can still be used to test the phone, but then the charger’s voltage capability will need to be looked at, as below.)

What is the charger you are currently using, what wattage, but more specifically what volts / amps is it capable of? Does it have PPS, does that go to at least 18V?

I don’t see PPS on the Anker you listed, it won’t do the fastest charging possible with the phone.

Having said that, you don’t get the absolute fastest charging on the Pixel (same with Samsung Galaxies) for more than a couple of minutes; charging from 40->100% will only be a couple minutes different between 18V charging and 9V charging.

One thing to check is whether the Pixel is getting hot during charging; heat can affect the charging speeds. Also, if you really want, turn off adaptive charging, that might be slowing things down somewhat as the phone tries to predict when you will pull it off the charger and may have decided to slow its charging due to that.