One thing that I found really helpful when I was making my own subliminals was to use affirmations that are simple and ones that you are not very resistant to.
So like if you wanted to make money, instead of having it say:
“I am rich, I am a millionaire, I am super wealthy”
You could have it say:
“I am blessed with great abundance, I always have what I need, I am comfortable with large amounts of money” The idea is to pick things you already feel to be somewhat true that you can expand on.
I just personally found this to be a much easier way to shift specific beliefs. I definitely always had my fastest results with very simple and direct affirmations like that.
My subliminals with lots of complex affirmations never seemed to work quite right and were honestly rather overwhelming because it emphasized the major divide in where I wanted to be vs where I was.
It is much easier to shift one belief at a time than overhaul your entire personality/life at once (for me at least). Also dont know if anyone said this yet, but stay away from negative phrases like “No” “Dont” “Wont” “Cant”. The old saying is that the subconscious cant process negatives, whether this is true or not, I have always followed this rule.
Good Luck!