I have tried to use some arc lines to form a circular connection, but it did not form solid area/ region area. Normally, it can do easily, but unfortunately, I did not make it easy, I tried to use arc lines to form the circular connection and automatically form a region area. How can I reconnect the lines and form a plane area and recorrect the problem?
Look at the shape from the side instead of from above. Probably one of the arcs is standing up so it is not in the same plane as the rest. Of so, delete that arc an redraw it in top view.
Otherwise share your file for us to look at.