Add an empty page

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\newpage
\thispagestyle{plain} % empty
\mbox{}

The major part is \mbox{}, which ensures the existence of an empty page.Following page will continue with numbering.

Insert a blank page

In the preamble:

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\usepackage{afterpage}

\newcommand\blankpage{
    \null
    \thispagestyle{empty}
    \addtocounter{page}{-1}
    \newpage
    }

In the page after which you want a blank page:

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\afterpage{\blankpage}

The following page will not continue with the numbering.