There are all kinds of ways to witness to others. If the minimum is now 'anything' then you can check the box if you had a conversation with a non-witness family member. Or a neighbor. Or someone on the line at the grocery store.
You can write a letter. That is time spent witnessing to others. If you are feeling particularly ambitious, write two! Send a text message with a link to the JW site. Make a phone call and leave a message. Once a month.
If they did the same with the meetings, imagine how many "active" members they will have!