Hey there!
You're welcome to advertise discord roleplaying servers in your signature or in the
other websites forum. Since they aren't taking place on CS, creating topics or posting about them in the actual RP boards is not permitted. Also, be aware that any content you link to on CS must follow our rules - especially regarding appropriate content and sharing of personal information.
As for 1x1 roleplays, if you find someone on CS who wants to roleplay on discord then that's totally fine. We have a 1x1 search thread
here. Many people offer discord as an alternative to roleplaying onsite so this may be a good place for you to look and start contacting some partners.
If you want to post in this thread, the rules require that you must be open to potentially RPing on CS too - if you are only looking to roleplay offsite, then posting on this thread yourself is not permitted (but you can still use it to look through other people's advertisements!).