How add spacing after of \paragraph

Question

How add spacing after of \paragraph{Parrafo}?

\documentclass{report}
\usepackage{float}
\renewcommand\paragraph[1]{$\bullet$ \textbf{#1}}
\begin{document}
\chapter{ } %if you want a name write it as \chapter{name}
init
\section{seccion}
\paragraph{Parrafo} this is a paragraph 

this is not paragraph (
and should not have a bullet)
\section{ seccion}
 \end{document}

When I put the bullet the spacing was reduced, now I want to increase the spacing.

Answer 1

Instead of redefining \paragraph from scratch, you can copy the definition from report.cls and add your \bullet:

\documentclass{report}

\makeatletter
\renewcommand\paragraph{%
  \@startsection{paragraph}{4}%
    {4mm}% <-- Space _before_ the paragraph title
    {3.25ex \@plus1ex \@minus.2ex}%
    {-1em}% <-- Space _after_ the paragraph title (with a minus sign)
    %                               V--------V added this to the original
    {\normalfont\normalsize\bfseries$\bullet$~}% Content before the paragraph title
  }
\makeatother

\begin{document}
\section{seccion}
\paragraph{Parrafo} this is a paragraph 

this is not paragraph (%
and should not have a bullet)
\section{seccion}
\end{document}