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If it’s deep it might need a gel filler. As with above instructions it needs to be clean and keyed up with a course sand paper, then wiped with acetone to reatuvate the gel slightly.
I would start by masking off area and a small perimeter around it. If it’s filler prepare the area as above and apply. With both gelcoat and gelcoat filler you can sand a little wider with progressively smoother paper first, starting at 80-120 working outwards to 400 ish. This will allow the gelcoat to flow into the smaller scratches and graduate the edge colours. Once cured sandi edges first with finer paper. Most people sand middle first to get it flat, but then when they do the edges, they go through the middle or high spots perfected first.
If it’s gel coat it might need an air inhibitor. Most kits come with wax in them, sometimes called topcoat, failing that some cling film or blue will inhibit the air from repair.
I am ok at gelcoat repairs but I am not great. If you want perfection pay someone, if you don’t mind a repair that will eventually age and look structurally OK it’s worth a go. If your boat is newer it will likely be easy to get a colour match from supplier. If it’s old, you probably will never match exactly unless you pay a pro.
A picture would help to see how severe it is.
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