There may be a few more, but these are the ones that come to mind at the moment. I also have an RP myself that isn't active in an everyday sense, as in only expect a post once at least every two weeks without dropping you, but I wouldn't want you to sign up for it if you are rather new to RPing, as it isn't exactly for new RPers as much If you are interested, here's the link:
Also, before you post in any RPs, make sure to find their OOC threads in the roleplay lounge. Most of the time there will be links in the RP itself, but if it doesn't then you just have to browse through the lounge until you find it. It'll be there that you submit your SU (sign-up).