I discovered and started using org-mode (and, as a result, Emacs) when I migrated from Evernote in '16. Today I use it for all my project, task and knowledge management needs, with some files going over 15MB in size. And I'm still loving it. Started out with headers only, and every time I wanted something more, it was always just there for the taking. Easy to use, and also crazy powerful. Can't think of anything else…
How do you handle PDFs, images, HTML/rich text snippets? Asking because Evernote supported all of those. It’s what keeps me using that app, even though I cringe every time I open it.
https://addons.mozilla.org/firefox/addon/copy-as-org-mode/ lets you copy formatted text from web pages to org-mode format
pdf's – do you mean downloading them? I mean, emacs can view pdf's, your computer can store them as files, making a clickable link to ./sicp.pdf from org-mode is just [[./sicp.pdf]] (or, while you're reading the pdf or browsing it in dired, hit your key for org-store-link and then in org-mode hit the key for org-insert-link).