Increasing dental hygiene recall frequency, proper home hygiene with a few dental adjuncts, smoking cessation, and a proper diet are indicated in a person who is at risk.
A proper dental exam and radiographs would be necessary to more specifically answer your question.
The best way to reduce plaque is to brush and floss properly after every meal. I would recommend that your dentist or hygienist spend some time with you demonstrating good home techniques. Depending on your visit, they may be able to recommend aides like a Waterpik or Rotadent that will help you.