usepackage{outlines}
usepackage{enumitem}
setenumerate[1]{label=Roman*.}
setenumerate[2]{label=Alph*.}
setenumerate[3]{label=roman*.}
setenumerate[4]{label=alph*.}
setenumerate[5]{label=arabic*.} %%% Not working%%%%%%
newcommand{tbf}[1]{textbf{#1}}
newcommand{tit}[1]{textit{#1}}

begin{document}

1 tbf{Science}:
    2 stuff 1
        3 stuff 2
            4 Stuff 3
                5 HELP %%% Command not working %%%%%

end{document}