hi! Most people on SRP are capable of what you see on frp style wise, but the way you get there might be different. Although typically people don't append. You may have seen me on FRP before around Heiyeong, or possibly even orbiting Aion (rest in peace door man).
(If you were wondering, my character is Ryeon)
However, the social aspect of SRP is a lot more casual. Unless there's a need to do 3+ sentences, most people will stick to one liners.
However if you hit them with an "advanced" action first you're more likely to get an "advanced" action back. That's the tactic I use to get people to detail things when I'm interrogating criminals. But remember that good roleplay isn't solely made by having long actions. SRP is very character-interaction driven, since there's no real threat like the world exploding. That being said, you're probably not gonna get the full image of a character through just one interaction. Start out mundane! As for vocabulary, even if there's not a lot of Sukitorus there's still people who are really good at what they do. Metaphors sometimes get you further than saying a fancy word. Some of people I advise you to seek out for good roleplay with fascinating characters include..
@rinis
@MikeShotZ
@cloudyhearts
@Escuzme
@Asya
@suneaterchan
Another place to look outside of just asking on the forums, try the various sports teams or government officials. Most of them have a roleplay aspect of some degree. I will admit as a member of the KPD, we're not constantly "detailrping" as people call it.
EDIT: a much older thread might be helpful to you, just to get a rough idea of who to look for.
https://schoolrp.net/threads/best-schoolrp-roleplayers.37417/