Looking back the entire experience was just a waste of time and meaningless. A lot of empty homes, coffee breaks and people uninterested in what we had to say.
It's very interesting, that was my experience too. I started preaching by myself when I was a little child, all the way up to when I was 23. Rarely I saw a person who really wanted a revisit for the right reasons.
Now as an adult, and also way more educated in the matter of negative influence and high demand, controlling groups, I know that research shows that most people who fall for groups like the JWs do not pay attention to their message unless it comes from a friend, a coworker or a loved one. Most people in these groups started following another person they know and/or have a degree of trust. It's no surprise that house to house preaching raises awareness at best.