i have been wanting to suggest this idea for a long time i would like to see new minecarts including-gold,wood,and diamond ones and they have special buffs to them
I think you're going to have to give some examples or be a lot more informative as to your overall suggestion if you want people to comment. Stating that you want X because of reasons Y and Z is not usually enough to get most people talking about the idea.
Start with outlining your idea; in this case you'd like to see a wider variety of minecarts available. State what benefits they'd possess, and why they'd make useful additions to the game. Compare the idea to current game mechanics and items that already exist in the game, and how they'd enhance the overall experience.
Most people need more to go on than just an opinion, which frankly, is all you've said so far about it: "I want more minecarts because it will be cool, and I want them".