Having to change up and down like you describe is due to two possible reasons.
1) lack of spring return in the cable system. Ie brake levers springs or drailler springs weak.
More likely
2) stiff cables.
Try oilling the cable first insitu use gravity to feed in down. Maybe turn upside down etc.
If that doesnt work..
Take inner out and coat with 3in1 or simular lube.
Inspect for kinks in the cable. Sometimes hidden. But can be confirmed if remove inner. Check inner slide cleanly through outer else out damaged.

You can change to teflon linned innercables and better outters.
I dont find birdies need it.

Another solution is add an inline spring somehow. Pen springs work well with some imagination.

Lastly check your cable end terminals.
Sometimes the groment wears out and the cable is not held in place properly.
I now fit brass spoke washers to strengthen them.