TLDR: can I edit docx files on word without a subscription and if not what are some apps that can allow me to do so

Like the title says I need the ability to edit .docx for college (sadly other file formats aren’t accepted AFAIK) and my Microsoft 365 subscription is expiring and will not be renewed thanks to you lovely people getting me on the Proton family of software and obsidian for note taking.

However i created a .docx file today and and got a popup in word saying my Microsoft subscription is expiring soon (in march I believe) and that I would lose many feature.

This scary message wasn’t very helpful as to what features id lose (probably a lot of them I don’t even use) but the internet has not been helpful in telling me if I can still view and edit all my docx files that I have been collecting and creating over the years and have migrated to my proton drive

If I won’t be able to access docx files in word what are some apps that can open them from my proton drive (this is a hard requirement for me).