If at all possible when making your first game I'd recommend making a single player game if you can think of a way that what you want to do could be conveyed that way. Multiplayer adds an entirely new set of things you have to balance and worry about. Making the single player game can teach you the things that you'd need to move onto a multiplayer. With that in mind I can recommend another product. The people that made this product are working on a multiplayer version of this soon targeting probably 16 people or so and said later they may look into MMO. For single player RPG though this is pretty popular:
https://assetstore.unity.com/packages/tools/game-toolkits/rpg-builder-177657
It has a very active discord community.
A lot of how-to videos on their youtube channel:
https://www.youtube.com/@BlinkStudiosYouTube