The only problem is that, if you want to have another character to try a different job. You'll have to start a new character and trained that character to level up to your main. In order, to have more characters on your party. You'll have to get lucky to create a party or join other players' parties to grind together. Doing this makes you don't want to play the same MMORPG for a while.
SP System:
I was thinking some MMORPGs should burrow the SP system from Dragon Quest Monsters: Joker to improve gameplay in MMORPGs. In DQM: Joker. When players level up their monster up to a certain level, their monster gains a few SPs that can be used to either learned new skills for combat or stats boost skills. Accumulating SPs to both skills make it's fun and easy to use skills in battles. The reason why I recommended this because if MMORPGs allow players to have more than one of their own characters in the party. Unlike DQM:Joker, let players gain few SPs every level. They can also level all their characters up they created.
Single-player mode:
Like most RPGs, players like to experience a story. This could be story mode. Adding single-player story mode should keep players busy and should make the game less boring.
Single-player mode:
Like most RPGs, players like to experience a story. This could be story mode. Adding single-player story mode should keep players busy and should make the game less boring.