Instead of GOTHAM you can use...

Remember back in the day when we used Gotham for EVERY project?

Or am I dating myself?

Here are some great alternative quintessential simple sans that are incredibly stylistically flexible:

Instead of Gotham you can use...

Montserrat

Google Fonts / designed by Julieta Ulanovsky, Sol Matas, Juan Pablo del Peral, Jacques Le Bailly

Proxima Nova

Adobe Fonts / designed by Mark Simonson

Metropolis

Fonts Arena / designed by Chris Simpson

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Pier Sans

Pangram Pangram / designed by Mat Desjardins

Arboria

Adobe Fonts / designed by Type O Tones

FF Mark Pro

My Fonts / designed by Hannes von Döhren, Christoph Koeberlin

Gilroy

My Fonts / designed by Radomir Tinkov

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Great sites for free (commercial use) fonts

Google Fonts - fonts.google.com

Adobe Typekit - fonts.adobe.com

Font Squirrel - fontsquirrel.com

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Other articles with free sans serif fonts

Canva - 60 free sans serif fonts to give your designs a modern touch

InscribeMag - 35+ Excellent Sans Serif Fonts (Free & Premium)

CreativeBloq - The best free fonts: 86 quality designs for creatives