Space reduction (for the title)

Question

In the provided latex code snippet below, there is excessive vertical space between the Chinese name "张三" and the top margin. As a result, my resume now extends to the second page. I am curious about how I can reduce this space to ensure that my resume fits onto one page. Thank you!

%%%%%%%%%%%%%%%%%%%%%%%%%%%%  Random Stuff %%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[letterpaper,11pt]{article}
\usepackage[UTF8]{ctex}
\usepackage{latexsym}
\usepackage[empty]{fullpage}
\usepackage{titlesec}
\usepackage{marvosym}
\usepackage[usenames,dvipsnames]{color}
\usepackage{verbatim}
\usepackage{enumitem}
\usepackage[hidelinks]{hyperref}
\usepackage{fancyhdr}
\usepackage[english]{babel}
\usepackage{tabularx}
\usepackage{fontawesome}
\usepackage{multicol}
\setlength{\multicolsep}{-3.0pt}
\setlength{\columnsep}{-1pt}
\pagestyle{fancy}
\fancyhf{} % clear all header and footer fields
\fancyfoot{}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
% Adjust margins
\addtolength{\oddsidemargin}{-0.6in}
\addtolength{\evensidemargin}{-0.5in}
\addtolength{\textwidth}{1in}
\addtolength{\topmargin}{-.5in}
\addtolength{\textheight}{1in}
\urlstyle{same}
\raggedbottom
\raggedright
\setlength{\tabcolsep}{0in}
% Sections formatting
\titleformat{\section}{
  \vspace{-5pt}\scshape\raggedright\large\bfseries
}{}{0em}{}[\color{black}\titlerule \vspace{0pt}]
% Ensure that generate pdf is machine readable/ATS parsable
%%%%%%%%%%%%%%%%%%%%%%%%%%%%  Commands  %%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\resumeItem}[1]{
  \item\small{
    {#1 \vspace{-5pt}}
  }
}
\newcommand{\resumeSubheading}[4]{
  \vspace{-3pt}\item
    \begin{tabular}{1.0\textwidth}[t]{l@{\extracolsep{\fill}}r}
      \textbf{#1} & \textbf{\small #2} \
      \textit{\small#3} & \textit{\small #4} \
    \end{tabular}\vspace{-8pt}
}
\newcommand{\resumeSubheadingContinue}[2]{
  \vspace{-3pt}
    \begin{tabular}{1.0\textwidth}[t]{l@{\extracolsep{\fill}}r}
      \textit{\small#1} & \textit{\small #2} \
    \end{tabular}\vspace{-8pt}
}
\newcommand{\resumeProjectHeading}[2]{
  \vspace{-3pt}\item
    \begin{tabular}{1.0\textwidth}[t]{l@{\extracolsep{\fill}}r}
      \textbf{#1} & \textbf{\small #2} \
    \end{tabular}\vspace{-8pt}
}
\newcommand{\resumeSubItem}[1]{\resumeItem{#1}\vspace{0pt}}
\renewcommand\labelitemi{$\vcenter{\hbox{\tiny$\bullet$}}$}
\renewcommand\labelitemii{$\vcenter{\hbox{\tiny$\bullet$}}$}
\newcommand{\resumeSubHeadingListStart}{\begin{itemize}[leftmargin=0.0in, label={}]}
\newcommand{\resumeSubHeadingListEnd}{\end{itemize}}
\newcommand{\resumeItemListStart}{\begin{itemize}}
\newcommand{\resumeItemListEnd}{\end{itemize}\vspace{0pt}}
%-------------------------------------------
%%%%%%  CV STARTS HERE  %%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
    \begin{center}
        % NAME
        {\huge 张三} 
        % SUBHEADING
        \
        \vspace{0.15cm}
        {\raisebox{-0.2\height}{\faPhone}
        {}}
        \vline ~
        % EMAIL
        \href{}{\raisebox{-0.2\height}{\faEnvelope}  \underline{}}
        \vline ~
        % LINKEDIN
        \href{}
        {\raisebox{-0.2\height}\faLinkedin\ \underline{LinkedIn}}
        \vline ~
        % GITHUB
        \href{}{\raisebox{-0.2\height}\faGithub\ \underline{GitHub}}
    \end{center}

Answer 1

If you add the showframe package to your preamble, it will draw a frame around the text block that holds all of your text/CV. You'll note that the name is at the top of the frame, so for moving it up you have a couple of options:

1. Adjust the top margin of your text block to be higher on the page (reduce the top margin.

   Instead of using the fullpage package with subsequent adjustments to margins, use geometry and set margin = 0.5in (say), and then tweak top as needed (for example, top=0.25in). If you follow this approach, also add \pagestyle{empty} to your preamble to remove any headers/footers.

   geometry also offers the showframe package option that draws a frame around the text block to showcase the margins. Now it should be easy to adjust the margins to suit your needs.

2. Insert a negative vertical space before setting your title; this should push it up/above the text block top margin.

   For this use \vspace*{<negative length>}, as suggested here, since the space needs to be added (actually subtracted) at the top of the page.

Here is a minimal example showing option 1:

\documentclass{article}
\usepackage[margin = 0.25in,showframe]{geometry}
\usepackage{fontawesome}
\begin{document}
\begin{center}
  % NAME
  {\huge Name}
\medskip
% SUBHEADING
  \faPhone ~
  \vline ~
  % EMAIL
  \faEnvelope ~
  \vline ~
  % LINKEDIN
  \faLinkedin\ \underline{LinkedIn}
  \vline ~
  % GITHUB
  \faGithub\ \underline{GitHub}
\end{center}
\end{document}