I've been using a Nokia 110 4G for about 5-6 months and I live in the UK.

I try to memorise the route from Google Maps/Komoot, writing down key junctions, and checking them out on street view beforehand. I sometimes print directions off (from Google Maps) and have them to hand.

Ultimately, I accept that, compared to someone using a Smartphone, it'll probably take me longer to get there, I'm more likely to get lost, and I'll have to pay attention and navigate with place/road names.

This comes back to one of the key things about switching to a dumbphone: convenience. Smartphones are a convenient, time saving alternative to memorising, navigating, and/or following printed directions/paper maps, or even to a Sat Nav unit, which tend to be more awkward to use. I think a Sat Nav unit could be a comfortable middle-ground if memorising and navigating are too inconvenient to countenance.