Does anyone else feel unappreciated when undermined about your job when you are the only one who knows your job?

Does anyone else feel unappreciated when undermined about your job when you are the only one who knows your job?

I work for a country club where we are a members owned club, that being said I have run across a problem with the Board President and a Chairman of my Committee. I handle all of membership and oversee new members as well as member retention. I have tried over and over to tell them they are trying to change and revert back to old ways of enrollment that do not work but they don't understand or trust I know what I'm speaking about. I feel extremely undermined by arrongance that it is truly frustrating that these people are coming in between how I do my job and how I know to do my job. I feel like if they do not value what I have to say then what is the point of me being here. Like I am supposed the expert in the field then why not listen to me when I'm telling you what works.