Setting paragraph indention

How can I set include an indent for each new paragraph? I tried multiple things but I can’t seem to fix it. This is my current main file:

documentclass[a4paper,man,floatsintext,natbib]{apa6}

usepackage[english]{babel}
usepackage[utf8x]{inputenc}
usepackage{amsmath}
usepackage{graphicx}
usepackage[colorinlistoftodos]{todonotes}
usepackage{ragged2e}
usepackage{hyperref}
usepackage{cleveref}
usepackage{apacite}
usepackage{float}
usepackage{placeins}
usepackage{afterpage}
usepackage{booktabs}

%title{Nudging People Into Paying Carbon Offsets - The Effect of the Decoy Effect in Flight Booking Processes}
%shorttitle{Nudging People Into Paying Carbon Offsets}
%author{textbf{Student}  Nino Oostrom  375181no  Rotterdam School of Management  Erasmus University  Burgemeester Oudlaan 50  3062 PA Rotterdam}
%affiliation{textbf{Coach}  Markus Weinmann 
%textbf{Co-Reader}  Name of Co-Reader}


setcounter{secnumdepth}{3} % numbered headlines

begin{document}
%maketitle

input{titlepage}

input{Texts/00_abstract}

clearpage

tableofcontents % create table of contents

%justify

% Assemble thesis parts
clearpage

input{Texts/01_intro} % Introduction
input{Texts/02_related_work} % Related Work
input{Texts/03_theory} % Theory & Hypotheses
input{Texts/04_method} % Method
input{Texts/05_results} % Results
input{Texts/06_discussion} % Discussion
input{Texts/07_conclusion} % Conclusion
bibliography{bibliography}
input{Texts/08_appendices}

end{document}

%
% Please see the package documentation for more information
% on the APA6 document class:
%
% http://www.ctan.org/pkg/apa6
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