suggestionbot
There are 2 repositories under suggestionbot topic.
Johns-bots/SuggestionsBot
Discord bot suggestion commands for suggestions
Sleepin1/Discord-Suggestion-Bot
This is a discord bot meant for Minecraft servers but could be used for other subjects. Use .suggest (entry). Comes with multiple configurations as the color of your embeds or your server name. If you come across any problem, feel free to DM via discord (Sleepin_#0001).