Narrow the visit before arriving
Kejetia can be the focus of a Kumasi outing rather than a quick stop between museums. Choose one shopping category or a guided introduction. That gives the visit a boundary without removing the chance to notice something unexpected.
Avoid setting a target number of stalls. A useful conversation with one seller may be worth more than hurrying through many.
Keep the group small enough to move
A large group should agree on a meeting point and who is staying together. Don't stop in a passage while everyone discusses the next move. Step aside before checking the map or comparing a purchase.
If you want photographs, ask first and keep the interaction separate from bargaining. A person agreeing to sell you an item hasn't automatically agreed to a portrait.
Make the exit easy
Pick a pickup location you can describe clearly and save it before entering. Leave time to find your way back without a fixed appointment immediately afterwards.
Use Kejetia Market as the main outing, then add food once the shopping is finished. If you've bought something bulky, returning to your accommodation may be the most practical next stop. The goal is to enjoy the market, not prove you can combine it with everything else in Kumasi.