Once you've redefined marketing, you can become aware of all of the opportunities for marketing yourself that existed all along. Make sure your colleagues and network members know about your current projects. Share your successes. Send news clippings about developments that would be of interest to managers. Promoting yourself in-house is just as important as sharing your skills, interests and talents with people outside your current workplace.
Marketing is more of a mindset than the ability to devote time to particular tasks.
Once it becomes a natural part of your daily activities, you begin to realize that you have opportunities to market yourself and your expertise in almost every context in which you interact with people. Don't expect instant results from your marketing activities. If you do, you'll get discouraged and give up too quickly. Keep in mind that it takes a long time for networking and marketing to bear fruit - like a promotion or a position in a new career area. Right now you're just planting seeds.