You say you like your character. OK, then maybe you know that no character development can happen unless you post regularly and get involved with him in the story. That a character grows through interaction with other characters, while doing his duty, while partying or while fighting. There can be (and are recommended to be) individual plots too. But, again, just planning them and not actually writing them doesn't count. He has to be actively part of the story if you want exciting things to happen to him, to grow, to develop, to make friends.

Equally, logging in and lurking on the site without actually writing doesn't count; your characters still don't get the development you want. There is no other magic solution than get to actually write.