LaTeX Document Layout: Bangla, English & Arabic

\documentclass[20pt]{extarticle}
% Language & font setup
\usepackage{polyglossia}
\setdefaultlanguage{bengali}
\setotherlanguage{arabic}
\newfontfamily\bengalifont[Script=Bengali]{Kalpurush}
\newfontfamily\arabicfont[Script=Arabic]{Amiri-Regular.ttf}
% Margins
\usepackage[paperwidth=8in,paperheight=11in,top=0.8in,bottom=0.8in,left=0.8in,right=0.8in]{geometry}
% TikZ border
\usepackage{tikz, atbegshi}
\newcommand{\drawmarginborder}{\begin{tikzpicture}[remember picture, overlay]
\draw[line width=0.5pt] ([xshift=0.5in,yshift=-0.5in]current page.north west)--([xshift=-0.5in,yshift=-0.5in]current page.north east);
\draw[line width=0.5pt] ([xshift=0.5in,yshift=0.5in]current page.south west)--([xshift=-0.5in,yshift=0.5in]current page.south east);
\draw[line width=0.5pt] ([xshift=0.5in,yshift=-0.5in]current page.north west)--([xshift=0.5in,yshift=0.5in]current page.south west);
\draw[line width=0.5pt] ([xshift=-0.5in,yshift=-0.5in]current page.north east)--([xshift=-0.5in,yshift=0.5in]current page.south east);
\end{tikzpicture}}
\AtBeginShipout{\AtBeginShipoutUpperLeft{\drawmarginborder}}
% Footer
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyhf{}
\setlength{\footskip}{45pt}
\fancyfoot[R]{\fcolorbox{blue!60!black}{blue!5}{\textcolor{blue!90!black}{\small \textbf{Your Name}}}}
\begin{document}
\setlength{\parindent}{0pt}
\begin{center}\textarabic{﷽}\end{center}
\begin{center}\textarabic{بِسْمِ ٱللّٰهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ}\end{center}
\textbengali{এটি বাংলা বাক্য। এটি পরীক্ষা করার জন্য লেখা হয়েছে।}
\bigskip
\textarabic{هذه جملة عربية مكتوبة لاختبار أن النص لا يلمس حدود الهوامش ولكن يبقى داخلها بشكل جميل.}
\bigskip
This is an English sentence added here to show English text works fine along with Bengali and Arabic.
\end{document}