Show the next site-level in submenu

Hey guys,

I have build a submenu for my website. Now I would like to show the next site-level of the current page.

Can you help me?

This is my TS2:
subMenu = Menu {
templatePath = 'resource://My.Project/Private/Templates/TypoScriptObjects/SubMenu.html’
entryLevel = 2
maximumLevels = 0
@cache {
mode = 'uncached’
context {
1 = 'node’
2 = ‘documentNode’
}
entryIdentifier {
documentNode = ${documentNode}
baseUri = ${String.toString(request.httpRequest.baseUri)}
}
entryTags {
1 = ‘NodeType_TYPO3.Neos:Document’
}
}
}