Well, I will recommend brushpack from Loish, it's really good for lining and colouring. But the brush settings won't really be useful, because everyone's way of drawing is very different.
Also, although "relatable slice of life" comics are popular, there are tons of them, so it is necessary for them to have a more unique look. Try drawing in different styles, make the art look more interesting and appealing, learn some anatomy, make the emotions more expressive, etc.