Cycle counts beat the annual count
Instead of counting everything once a year, count a slice every week. Rank items by value: the top 20% of lines that make up most of your stock value get counted monthly, the rest quarterly. A mobile phone accessories shop might count phone cases monthly and cables quarterly.
Cycle counts catch problems while they are small and recent enough to explain. They also make the year-end count faster, because the book quantities are already close to reality.