I have 36 years in NLP. It started with taking three years to achieve Master practioner level, the standard in the 1980s to have the understanding and skills that the science demands. This training took the understanding of NLP far beyond the modern thinned down version. The 4thLevel, doesn’t negate your modern NLP, it takes the learning you have from your modern NLP to a higher level.
A consultation should answer some questions and help you to enhance your understanding and skills in whatever area of NLP you are operating in.