"Change is scary.
Because doing something differently might mean doing something that you've never done before. Something where you don't know what the result will be. And that's also really scary.
The fear of the unknown.
Just like the classic saying “The devil you know versus the devil you don’t”. That's probably why a lot of people might stick to their current program, even if it's not working as well. It's comfortable. You know it.
But change can also be a really good thing, especially if you have somebody guiding you through the change process. Someone with experience. Someone to encourage you. Someone to keep you accountable. Someone to answer your questions. Someone to keep you on track.
Banging your head against the same wall likely won't produce you results. It will just give you a headache."