What I'd do is have something high pitched like a synth arpeggiated that hits every maybe 4 or 8 bars. It's just there to give a hint of that high frequency being used. I'd also have it delayed to give a hint of depth. So like a high pitched arpeggiated synth or something like that, which is in the background with delay and only hits every 4 or even 8 bars. Doesn't have to be loud or long or anything, or like up front in mix either.
TBH the beat is fine on it's own just as is. But if I had to add something that would be next. Wouldn't be something like a main part of the beat, considered more like a little accent.