I don’t know if I will take the advice of someone’s degoogling consists of getting an Alexa device…

I can degoogle except for gmail and maps.

Apple Maps in my country sucks. There are no good alternatives to Google Maps.

Gmail - I have too much stuff there to move away.

OpenStreetMap?

Could you create a new mail account and gradually stop using the old one, and keep it only as an archive of old messages?

Online directions and traffic congestion indication was not available.

Take a look at MagicEarth, which provides both, based on OpenStreetMap data: https://www.magicearth.com/

Gmail is the easiest to replace by far. You can copy everything to Fastmail in hours and be done.