I would like to keep my subsubsection header the same size of the paragraph font, can someone help me?

at the moment the subsubsection font is the equivalent of \small whilst the paragraph font is \normal. 

This is my preamble:

```
\documentclass[12pt]{report}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage{fixltx2e}
\usepackage{grffile}
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{floatrow}
\usepackage{amsmath}
\usepackage{longtable}
\usepackage{tocbibind}
\usepackage{fancyhdr}
\usepackage{titlesec}
\usepackage{epstopdf}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{tabularx}
\usepackage{tabu}
\usepackage{ragged2e}
\newcolumntype{L}{>{\RaggedRight\arraybackslash}X}

\titleformat{\section}
  {\normalfont\fontsize{14}{12}\bfseries}{\thesection}{1em}{}
\makeatletter
\renewcommand{\paragraph}{%
  \@startsection{paragraph}{4}%
  {\z@}{1.2ex \@plus 1ex \@minus .2ex}{-1em}%
  {\normalfont\normalsize\bfseries}%
}
\renewcommand{\baselinestretch}{1.0}
\makeatother
\setcounter{secnumdepth}{3}

```

and then I just use `\subsubsection`