I don’t know what OS you have so, I am going to keep this generic.
Open a word processor, for example, I opened Libreoffice. Click on the fonts dropdown to see what your system has available. I looked for something mono, but bolder. For example:
Source Code Pro Medium
Source Code Pro Semibold
Source Code Pro Black (which is really really BOLD)
I like DejaVu Sans Mono and Overpass Mono as well.
If nothing on your system interests you, check out
https://www.fontsquirrel.com/ for more fonts. Look at the “Classifications” on the right and click on “Monospaced”. Download and install a font that interests you. https://fonts.google.com is another good site. You will have to figure out how to install fonts on your system, but I (on linux) just download the zip file, move it to
~/.fonts/ Unzip it and then
fc-cache -f -v to make the system aware of them. I am sure there is some more elegant want to manage fonts on a linux system, but … that’s what I know.