Im sure this has been said a million times already so please forgive me. How do you promote a less popular character? I'm not sure how to get a discussion going for my Barbara thread.
I had a lot of experience so, here it goes:
Be ready to not have an easy time, it's just not easy. Try to actually bring stuff yourself, finding a way to improve the OP, bring playstyle or especially moveset ideas. From personal experience, moveset ideas receives a lot of interest, maybe try to make one!
If your problem is you lack support....this is difficult. You can try to help by advertising (you seem to do that from your sig though, maybe try to make it more catchy?), but then, changing the sig will never help if you don't actually post. So, I suggest you actually post about stuff, might not be related to what you support, but just telling opinions on speculation might help a tiny bit, fun fact, I stsrted to get a good chunk of support after I really began to be active on social and potd thread because of my sig and most of the post wasn't explicit advertisement.
But of course, if you want to draw people into your thread, you might just randomly try to talk about the character in this thread. This is luck tbh, it might have some few people that care, sometime you get nothing, but other times, you might just shift the topic for sometime.
But the main problem, is that these CAN help, the biggest difficulty you will face is by not being popular, you need to put more effort since your scope of support is really limited. I have huge respect for people like the ray thread OP that do a lot of effort to show unpopular ideas so that supprting isn't just boring with a few getting everything. It just shows that not only people want the character, they want him so much they want to help, to me this is dedication.
Though, I used wacky bump strat sometime....Seriously, I went sometime paranoid on the usets viewing thread, but don't go there....I'm crazy
And if you really are ready for this, go on social medias....it helps, but the setup can be hard....
That's all I know