Why is my web traffic decreasing despite my keywords ranking on top?

Hello everyone.

Why is my web traffic decreasing despite my keywords ranking on top?

My website recovered from Google December 2020 Core update on 1st July. After recovery, I witnessed a 50% growth in traffic. On 12 July 2021, I noticed an almost 20% drop in my traffic but I couldn't figure out why my traffic dropped. My keywords are still ranking in top positions.

What could be the possible factor that causes a drop in my traffic? I would really appreciate is someone assist me here.

Thank you & Regards