Extra lenses recommended (besides kit lens)

Hello, I own the Sony A7C II + kit lens (Sony 20-70mm F4), in general, I think it’s a very versatile lens, however lately I’m feeling it’s kinda heavy and doesn’t have the bokeh effect I want and I’m recording more at night, so I was thinking about buying an extra one.

For context, I usually use my camera mainly for vlogs (outside, inside, etc), and I take photos veeeeery occasionally, so my main focus is video. Which lens would you guys recommend? I’m thinking something between 14 to 35mm, and an aperture around 1.2 and 2.8 max.

Thank you so much!