In most such cases, a non-exclusive license is the best method of marketing your idea. Many people who get a patent expect money to start flowing without any additional effort. It doesn't work that way. Getting a patent is only half the job. Now you must market your idea.
Marketing takes as much effort as getting the patent.
You must identify companies that could have an interest in your idea, and you must identify the proper person to approach within each organization. Sending a blind letter is usually wasted effort. There are many ways to deal with infringers. An infringement suit should be the last step. The first step is to notify the infringer by registered mail.