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Take some time putting your suggestion together. A good suggestion is important to reaching your self-hypnosis goal. I won't go so far as to say that the lack of a good suggestion means you will not succeed. I am often surprised by what people achieve in spite of not following precisely a set of rules.
There is probably no bad suggestion, unless it would be one that tries to harm somebody in some way. But you wouldn't do that anyway.
Write out your suggestion however it comes to you. Write it longhand. Don't worry about getting it right the first fime. Then polish it to make sure it says what you want it to. Compare it to the characteristics of a good suggestion described in this section, and make changes if you need to.
Make sure you have enough detail so the whole thing is clear and really says what you want it to.
Put the suggestion aside and go back to it the next day, after your subconscious mind has had a chance to work on it. You will probably find that new and/or better phrases will easily come to mind. Don't spend too much time on your suggestion. It doesn't have to be perfect. It's really just a tool, or a means to an end.
The grammar is up to you. If you're bothered by grammar that isn't precise, fix it. If you don't really care, then don't worry about it (at least not here). After all, you're talking to yourself.
If you are more comfortable with a language other than English, use that for your suggestion.