The issue here is that you have added all your banners, divided between clients and categories and you're looking for a solution which doesn't involve installing a 3rd party applicatoin.
Unfortunately the Joomla banner module only supports alternating between banners of either the same client OR the same category. The setting is in your Joomla > Module Manager > Banner... What I do is I don't select a client but instead just select a category. Set it to only display 1 banner at a time.
If you want other categories to display, consider setting categories as vertical, horizontal and square banners. This means that you can have 3 modules each displaying banners from each category and position these as appropriate.
Category: Joomla :: Article: 218
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