Moving this to a top-level comment.
Overleaf is fantastic, as long as you are okay with non-WYSIWYG document editing and learning some LaTeX.
Typst is also worth looking at, as a similar concept. It uses a very different language than LaTeX, but feels more in touch with modern sensibilities.
I’m not a huge fan of Google as a company, but Google Docs seems to be the first and only one that actually put some new thought into how to organize their toolbar, so that’s my go-to.
Edit: thinking a little further, my other go-tos are Overleaf or Typst. Those do require that you be okay with a non-wysiwyg editor of course, but they are excellent.
As long as you’re okay with an interface that slavishly clones the terrible MS-Word ribbon bar.
I find them okay, but I am much more concerned with consistent fonts than with a variety of decorative fonts.
The default fonts feel very old-fashioned though.