More detail
Seasonality is a planning problem, not a luck problem. The more clearly you can see last season, the better you buy this one.
A system that records every sale against stock gives you that picture, so you commit cash to the lines that actually move and avoid dead stock that sits past the season.
Related questions
How do I avoid dead stock after the season?
Can I see last year for comparison?
Veira gives Kenyan shops one calm app for selling, M-Pesa, KRA eTIMS and stock, with a free terminal. Book a demo and see it set up for your trade.