Hi, I hope you're doing great. What is your concept of gameplay for combining the RPG and MP elements? is it something like diablo and titan quest? or do you mean something like Dota? And what is the realising platform of it? I suggest basing the gameplay on that platform because it has a major effect on its optimization.
I've worked as a game developer for 5 years, therefore I think I can help you out and make your game with unity. I'd be glad to share ideas and talk more about the game's details if you contact me.
thanks for putting your time on reading this bid