The unfortunate reality of suggestions is that you can do everything right, and follow the good suggestion tips well and make your suggestion presentable very well with creative new concepts and great reasoning behind them and it can still not be very successful. I've spent up to Days and Weeks on Suggestions and they still don't get a lot of acknowledgement even though I've worked very hard on making them "good". All one can do is think carefully over concepts you believe could improve the game, create them as suggestions, analyze other people's suggestions to see what worked well and what didn't, and taking into account the Positive and Constructive Feedback on one's own suggestions to continue to improve your own current Suggestions and future ones.
It is a tough road, but don't give up!