I want to cover this face quickly? How could I do so?

I tried to used line tool and connect the plan, but I don’t think it go anywhere.
Thanks

If tracing one edge of it doesn’t result in a face, there’s something wrong with the edges. Not planar, a gap somewhere, something. As usual, it’s impossible to tell from your screen shot what the exact problem is. By now you should know that sharing the .skp file is the way we’ll be able to tell you exactly what the issue is so I’m not going to ask.
face

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thanks I find another way to solved it.