The core goal of your walking should be to enjoy your walk and make time to look at nature and be nurtured by it. Do not push yourself too hard in these difficult times. Nordic Walking is as much for your mental wellbeing as your physical fitness. Find at least one amazing thing in nature that cheers you up on every walk.
At the same time: On each walk take a bit of time (e.g. twice ten minutes on each walk) to work on your technique. Pick one thing of the following list and pay full attention whether you are doing it. If not, self-correct