I want to reduce the space between the text and the bottom of the page from the following working example. So that I can add more text to the page.
\documentclass[a4paper]{scrlttr2}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[utf8]{inputenc}
\usepackage{marvosym}
\usepackage{blindtext}
\KOMAoptions{%
pagenumber=false,
parskip=full,
fontsize=11pt,
firstfoot=false,
fromalign=right,
fromphone=true,
fromemail=true,
fromrule=false,
foldmarks=false
}
\newcommand{\myFirstname}{John}
\newcommand{\myFamilyname}{Doe}
\newcommand{\myStreet}{3500 West Olive Avenue}
\newcommand{\myTown}{Burbank, CA 91505-5512}
\setkomavar{date}{\today}
\setkomavar{fromname}{\myFirstname\ \myFamilyname}
\setkomavar{signature}{\myFirstname\ \myFamilyname}
\setkomavar{fromaddress}{\myStreet\\\myTown}
\setkomavar{backaddress}{\myFirstname\ \myFamilyname, \myStreet , \myTown}
\setkomavar{place}{Burbank}
\setkomavar{fromphone}[\Mobilefone\,]{(01\,23)\,45\,67\,89\,10}
\setkomavar{fromemail}[\Letter\,]{john.doe@email.de}
\renewcommand*\familydefault{\sfdefault}
\setkomavar{subject}{Dies hier ist ein Blindtext zum Testen von Textausgaben.
}
\begin{document}
%
\begin{letter}{Richard M Winsor\\
2192 Lawman Avenue\\
Arlington\\
22204 Virginia
}
%
\opening{Dear Mr Winsor,}
%
\blindtext[1]
\noindent \blindtext[4]
\closing{\raggedright Yours sincerely,}
\enlargethispage{6\baselineskip}
\medskip
\end{letter}
\end{document}

enlargefirstpageas described in section 4.10 of the English KOMA-Script manualscrguien.pdf. Or move your\enlargethispagebehind\opening, before\blindtext[1]. If you want more text on the second etc. page, use eitherDIVor thegeometrypackage. – Schweinebacke Apr 01 '17 at 10:19