How to fix a bowled Threshold?

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I have a basement door going out side and the threshold is bowled down! Trying to figure out how to fix it! There is a gap between the middle of the door and threshold. The threshold seems to be plastic? This area is very unlevel ,there is an outside stairwell on the other side of the door and the concrete is sloped for the drain at the bottom of the stairs! Trying to accomplice 2 things keeping water out and cold air out! Have the stair well covered with tin to keep as much water out as I can! Thanks for any help anybody can give me! Lisa Jo

how to fix a bowled threshold

You can see the bowl in the threshold here!

how to fix a bowled threshold
how to fix a bowled threshold

You can see the gap between the door and threshold here!

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