Investor want fixed income. That’s the character of investor at my country. I am looking for investor now, but my business at forex trading firm. how to make sure the investor for investing at forex trading? If I advertise , what is the best strategy or model ?

Fixed income is not possible in forex. It all depends on market movements. You can have a strategy- you can make trading targets for example how many hours to trade, income per day target, trading strategy , use trading tools, etc.In this way you can attract customers for investing and can assure your customers fixed income as per their targets.
Be careful while trading with market movements.