A fellow member of the Fanfiction community, 44-MagicalKilljoyRani-44, and I would like to bring to your attention "The dos and donts of making an RP". I understand that when you get an idea for an Roleplay you are just excited to get it out there and end up leaving many details out. Which makes your glorious idea die out because nobody is interested in an rp with little to no backstory. Explain your plot and the chase of the rp. Establish rules to make sure the ones who participate, respect what Is okay and what's not.
Well I'm no expert roleplayer, but you could add stuff about the idea (making sure it's original, making sure it's something that would last and not get old really soon, thinking of ideas to constantly make it original) or your attitude towards others (don't be afraid to be harsh and kick people off the thread, but let them have a choice to do whatever they want). Just stuff like that. Those are good tips though.️