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If you find NLP techniques helpful, make a regular practice of them. Try practicing once a day until you get in the habit of using your techniques whenever you need them.  Consider keeping a diary where you track your NLP practice and results. Talk to a mental health counselor about what you are doing with NLP. You can pay to take workshops in NLP. There are summer trainings in Santa Cruz, California, as well as other places around the world. You can also find online courses with a quick internet search.  There are profession-specific classes available in many cities. Consider getting a training for everyone at your place of work. While NLP is no longer considered a valid psychological tool, many places of work find it useful for inspiring a positive attitude in their team. Classes in NLP tend to come with certification. You can become certified simply as a practitioner, meaning someone who has taken a class in NLP. To be able to market yourself to teach NLP techniques to others, take training classes that will provide you with certification as a trainer or facilitator. While many people have found various practices of NLP useful, it isn't a scientifically verified school of thought, and in same cases is believed to have harmed traumatized practitioners. If your NLP practices are making you feel worse, or simply aren't changing your mental state, consider better supported forms of cognitive intervention.  See a therapist. Try cognitive-behavioral therapy. Experiment with mindfulness practices
Practice on a regular basis. Take a class. Get a certificate. Consider alternative practices.