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I tried doing, mathbf{Rightarrow}, but nothing happens.

How do I make the Rightarrow symbol bold?

If you would recreate the arrow in tikz, you could control how bold you like it by changing the line width to whatever value you like

documentclass[border=6.662mm]{standalone}



usepackage{tikz}



newcommand{myarrow}[1][0.1pt]{tikz[baseline=-0.26em,y=3em, x=3em]{filldraw[line width=#1] (0.4202,0.0021) .. controls (0.4202,-0.0000) and (0.4188,-0.0018) .. (0.4171,-0.0025) .. controls (0.3917,-0.0092) and (0.3699,-0.0236) .. (0.3509,-0.0401) .. controls (0.3355,-0.0538) and (0.3225,-0.0704) .. (0.3130,-0.0890) .. controls (0.3119,-0.0915) and (0.3094,-0.0929) .. (0.3066,-0.0929) .. controls (0.3028,-0.0929) and (0.2996,-0.0897) .. (0.2996,-0.0858) .. controls (0.2996,-0.0848) and (0.3000,-0.0837) .. (0.3003,-0.0827) .. controls (0.3087,-0.0665) and (0.3193,-0.0517) .. (0.3316,-0.0391) -- (0.1181,-0.0391) .. controls (0.1143,-0.0391) and (0.1111,-0.0359) .. (0.1111,-0.0320) .. controls (0.1111,-0.0282) and (0.1143,-0.0250) .. (0.1181,-0.0250) -- (0.3471,-0.0250) .. controls (0.3611,-0.0137) and (0.3766,-0.0046) .. (0.3935,0.0021) .. controls (0.3766,0.0088) and (0.3611,0.0179) .. (0.3471,0.0292) -- (0.1181,0.0292) .. controls (0.1143,0.0292) and (0.1111,0.0323) .. (0.1111,0.0362) .. controls (0.1111,0.0401) and (0.1143,0.0432) .. (0.1181,0.0432) -- (0.3316,0.0432) .. controls (0.3193,0.0559) and (0.3087,0.0707) .. (0.3003,0.0868) .. controls (0.3000,0.0879) and (0.2996,0.0889) .. (0.2996,0.0900) .. controls (0.2996,0.0939) and (0.3028,0.0970) .. (0.3066,0.0970) .. controls (0.3094,0.0970) and (0.3119,0.0956) .. (0.3130,0.0932) .. controls (0.3225,0.0745) and (0.3355,0.0580) .. (0.3509,0.0443) .. controls (0.3699,0.0278) and (0.3917,0.0133) .. (0.4171,0.0067) .. controls (0.4188,0.0059) and (0.4202,0.0042) .. (0.4202,0.0021) -- cycle;}}



begin{document}



$Rightarrow$ 

myarrow 

myarrow[0.25pt] 

myarrow[0.5pt] 

myarrow[0.75pt]



end{document}

Here is a way with which you can make any symbol fat: use the contour package.

documentclass{article}

usepackage{amsmath}

usepackage[outline]{contour}

begin{document}

begin{enumerate}

item Just the symbol:

contour{black}{$Rightarrow$}



item The symbol between two bold symbols:

$boldsymbol{A}mathrel{contour{black}{${Rightarrow}$}}boldsymbol{B}$



item Using texttt{contour} for everything:

contour{black}{$ARightarrow B$}



item verb|contourlength{0.02em}|:

bgroupcontourlength{0.02em}contour{black}{$ARightarrow B$}egroup



item verb|contourlength{0.01em}|:

bgroupcontourlength{0.01em}contour{black}{$ARightarrow B$}egroup



item Other symbols:

contour{black}{$ALeftarrow B=Cne D$}

end{enumerate}

end{document}