25% DROP IN SALES AND IMPRESSIONS SINCE MID NOVEMBER

HI guys

I know there is no magic wand but this one has me baffled

Been on Amazon over 15 years ..Ups and downs ,Amazons policies ,Royal mail strikes etc ..But battled on as business is still good

However ,throughout 2024 sales have been up 5-10% on 2023 or level at worst

But since early mid November my sales and impressions are down 20-25 %

£2000 per day down for the last 3 days

I rely heavily on xmas as we sell novelty clothing etc so this a real kick in the nuts ..Similar to post strike 2 years ago

Anyone in similar position or do I have an issue ?

I am 50/50 FBA and FBM ...FBA is about 15%down FBM more

Strangely my revenue per impression is up 1.45 to 1.50

Any ideas,help would be greatly appreciated as I am at a loss as to what I may have done