Certification does not make you a good QDMA person. It just gives you a name. One step may be is to get certified for the handling of herbicides and insecticides. Learn all you can about QDMA and practice it.
Drs. lawyers, etc. all have their "shingles" but does that make them that good in their profession? Learn all you can and then practice it. If you are good at it, people will be looking you up.

Russ