Affirmations come in many shapes and forms. Some are quite long and some are very short, however, affirmations aren’t ‘one size fits all’.
In order for an affirmation to work as it is intended, the affirmation should sound natural to you in order to see results more quickly. Yes, you can fake it until you make it, but if you can modify the affirmation so that it sounds more believable to you, then you won’t necessarily need to go through the sometimes long process of faking it.
For instance, the affirmation ‘I am a happy healthy multi-millionaire‘ may not set well with you if you truly do not believe you can attain multi-millionaire status.
Yes, you can fake it by repeating the affirmation until it becomes a reality which may take years just for your mind to believe it’s a possibility, but by modifying it into something you are more comfortable with like ‘I am happy healthy and prosperous‘, you may experience measurable results more quickly.
The affirmation you choose is up to you, but you should make sure that it is natural while pushing your own limits.