I don't see why not! And to be honest.. if your not sure what to make, do something that someone hasn't made/realised yet. I suggest making like a mine skript or a party skript (like hypixel lol) or something more creative!
Ok
1. Life is fun (by TheOdd1sOut)
2. TheFatRat - unity, time lapse, jackpot, windfall
3. Press start MDK
4. Castle on the hill (by the amazing Ed Sheeran
Ok so I could be wrong but minehut recently had a update with spawn protection! So I recommend going to the configuration file and edit stuff there (it might help)
Did you restart the server after you installed the plugin??
I also recommend doing /help and find the command that is for the plugin or just watch a YouTube video, I don't really use gui shop plugins sorry, my knowledge with this plugin is short ☹