General awareness can be helped by finding a net of features on your area map, so that the maximum distance between any two is less than twice your min inflight vis. This way you can always see one of them.
Mark and memorise them. A few a day, whilst on the bog as others have advised.
I seem to remember I needed just under 40 for the whole of Wales.
You will probably need different features for low and medium level.
This should mean that you never get lost at BFT, are able to free nav easily at AFT, and keep SA on the front line.
Like everything else, it's quite a lot of work the first time, but much easier later.
You can also do it route by route. Probably only need 5/6 features for a typical ml navex. Ups your confidence too.