Discrepancy in iPhone 13 mini's local and iCloud photo storage

i have an iPhone 13 mini, i’ve subscribed to 400GB iCloud, in iCloud my photos is only 39.7GB but in my iPhone storage it shows 81.35GB, i only have 4000+ photos and 100+ videos, i have cleared so many pictures and videos but it’s still shows 81.35GB, how can i fix this ? what should i do ?

[Re-Titled by Moderator]