Perhaps take a look at the Contest Section if you want to do some writing to sort of create a resume for yourself.

Or perhaps a Casual RP thread in the vein of a bar or telling stories around a campfire.  Or like Year 4427 1/3 Intergalactic Dating Profiles.  I once had someone suggest a super power to me and used that as a writing prompt.  Really anything to tell people a little about your interests, writing style, sense of humor, commonly used characters.  All of that helps.

You might consider joining the Discord as well.  A lot of users are active there, some more active there than here, and it has (I believe) two sections geared toward starting RPs and discussing potential RPs.

OR OR OR OR, hell, if you want start up a thread in the Arena section.  It's pretty much dead as a doorknob.  I've got a Halfling Wrestler ready to drop kick your knees outta your knees and a delusional self aggrandizing Muscle Man ready to pick you (or any other heavy object) up and drop you repeatedly until someone rings a bell and lifts his hand.  I could do like a fantasy character too so long as you don't mind it being facking stupid.

Below is a guide I put together from various users input:
https://www.roleplayerguild.com/topics/184596-rping-aint-always-easy-a-collaborative-guide-to-the-stuff-that-makes-t/ooc

And Welcome!

I started here the same way.  RPed for Something-teen years before my old forums were shut down.  Came here.  The transition can be awkward but this forum is well equipped for writing and has several great writers.

Look at JB, Apathy, and Poohead.  And me of course.