Gurudev made it clear time and again that the work that we do is our sadhana; it may bear fruit or not – that is the Lord’s will.
Keep on doing what you are doing now. Do not try to estimate how far you are effective. No individual can give spiritual solace to another. It is not in our hands. Narayana alone gives joys and happiness to others. We chant the glories of the Lord as our offering unto him and if others are listening to it and getting benefitted, it is their glory and not ours.