Not that anyone asked, but I've fucked off and come back several times over the years.  Sometimes for a year or more at a time.

Try finding some writers or RPers that you like and just read the stuff they put out.  For me it helps me get to thinking about what character I might want to join that RP with and what I might want to do with it.  Or if there are like 4 great writers and 1 not so great writer who has a cool character it might get you thinking about what you would do differently if you were writing for that character.

It's always easier, for me at least, if I start in thinking about what I would like to do before I just start doing it.

Ohhh, that's a cool Captain America, but you missed an opportunity there to have So and So show up.

Ohhh, what a cool Batman.  I'd like to RP as that guy's Joker, or Robin, or Commissioner Gordon.

Ohhh, what a fun bunch of people doing an Elder Scrolls RP.  I'm not very creative so I'd like to join as a big orc with a big smashy hammer.

Or even just following some good stories and then shamelessly ripping them off.  The secret is to have no shame.