如何将章节标题移近纸张边缘？

Question

我想将章​​节标题移近纸张边缘，这样一页就能容纳更多文字。我已附上序言以及页面当前的样子。

\documentclass[11pt,oneside]{book}
\usepackage[a4paper, margin=2.5cm]{geometry}
\usepackage{titlesec}
\titleformat{\chapter}{\bfseries\Huge}{\chaptername~\thechapter.}{0.4em}{}
\titlespacing{\chapter}{0pt}{*0}{*1}
\usepackage[toc,page]{appendix}
\usepackage{graphicx}
\usepackage{adjustbox}
\usepackage{tabularx}
\setlength{\parindent}{4em}
\usepackage{amsmath}
\usepackage{bbding}
\usepackage{float}
\usepackage{natbib}
\usepackage{lipsum}
\usepackage{caption}
\usepackage{textcomp}
\usepackage{siunitx}
\usepackage{subcaption}
\usepackage{array,ragged2e}
\newcolumntype{P}[1]{>{\RaggedRight\arraybackslash}p{#1}}
\usepackage{longtable}
\usepackage[table]{xcolor}
\usepackage[utf8]{inputenc}
\usepackage[nottoc,notlof,notlot]{tocbibind} 
\renewcommand\bibname{References}
\usepackage{url} 
\usepackage{amssymb}
\captionsetup[figure]{margin=1.5cm,font=small,labelfont={bf},name={Figure},labelsep=colon}
\captionsetup[table]{margin=1.5cm,font=small,labelfont={bf},name={Table},labelsep=colon}
\tolerance=1
\emergencystretch=\maxdimen
\hyphenpenalty=10000
\hbadness=10000
\begin{document}