Currently there is no format for suggestions. Merely select the most appropriate sub forum for your suggestion.
When making your suggestion, anticipate the questions which may arise out of your suggestion. Try to answer them even before they're asked. Quality suggestions should rise to the top as intended. The quality and effort put into a suggestion should come before anything else. Before suggesting something, remember that first impressions are key.
Effortless suggestions waste everyone's time and may be removed without notice.
Why use tags at all?
Tags in this forum may seem redundant but they're not. Topics in Community > Suggestions are broken up into sub forums. However, if you wanted to see all suggestions across all forums at once, the only way to do so is with the suggestion tag.