Here’s a possible suggestion.
Why not use MyRoute and select the OpenTopoMap layer?
Yiu may need to switch to Defaukt (OpenStreetMap) from Default HERE, in order to display it. That doesn’t matter but do tidy-up the route in HERE if you intend to run it on a Garmin device. It probably won’t matter too much if you don’t, though it’s best practice to do so.
View attachment 439691
Likewise, some of the other map layers might suit, too.