I wouldn't change. I would get rid. Hahha!
The bad guys because every time they attempt to kill the pra'nang, they always end up failing. Waste of screen time.
The nang'rai. They're always screaming, B-slapping the nang'ek or someone, whoring around, and just a wacko. Another waste of screen time.
The mean mother or mother-in-law. Like, come on!
There are so many things that I would want to get rid of in lakorns, especially scenes that are just filled with nonsense which makes the lakorn drag.
If I could change anything in a lakorn, I would say the attempt r-scenes. If you're going to do it, just do it. Hahha! And fake, angle kisses. Like, get real. They all act like they're innocent offscreen.