In the first place you should understand that you are not the only one this is happening to - so don't think you did something wrong. If you tried to help and encourage and you did your best it is the most you can do.
What you should not do is give up on them - maybe there is a temporary obstacle and they will start again when it is removed or solved. Keep on doing your best and be satisfied that you do not have a magic wand to make them work again.
Most of us have this happening - you are not alone.
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In the first place you should understand that you are not the only one this is happening to - so don't think you did something wrong. If you tried to help and encourage and you did your best it is the most you can do.
What you should not do is give up on them - maybe there is a temporary obstacle and they will start again when it is removed or solved. Keep on doing your best and be satisfied that you do not have a magic wand to make them work again.