First time using Sass!

First time using Sass with this project. This one took me a little while because I was starting to lose some motivation and I was having a very hard time sitting at the computer to code, even though the site itself was relatively simple. How do you guys manage to push yourself to always keep working and stay motivated?

Also, as more of a technical question- what is your workflow with media queries using sass? Do you use mixins? Do you include media queries in the main.scss file, where you have something like:

@use resets
@use navbar
@use footer
....
@media (min-width: 500px) {
  @use break_500px
}
...

where lets say, 500px is a module with style changes for the site. Or, include media queries within the actual layout modules like _navbar.scss or _section.scss?

Thank you!