1. Direct Mail. This strategy is by far the oldest known type of offline marketing. Marketing through direct mail requires you to send snail mail to your potential or loyal customers so you can do any of these things: a) know more about your demographic; b) generate leads; c) encourage them to make more purchases; and d) get in touch with them in a more personalized way.
With direct mail you lessen the time they spend raking over their emails and SPAM. What you have is a personal connection with your clients.
2. Guerilla marketing. This is a series of unconventional methods that you can do offline.