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Simple use exclude option. Eg: [geot exclude_country="US"] Will show to everyone except US users[/geot]
It's possible that cache mode is enabled in the plugin. In order to save resources the location will be cached into the usser session. Simple disable cache mode or refer to debugging guide for more options.
Check the documentation for Geo Redirects WordPress plugin.
The answer to this question is a bit long to appear in here but we wrote a nice post about it!
The plugin let you geotarget individual menu items but if you need to geotarget a full menu you can do the following:
WooCommerce Price Based on Country will let you set multiple currencies for your Woocommerce store. With this snippet you will be able to use both plugins at the same time