Can't sign in to support.microsoft...what to do???

[Win10 Version 20H2 (OS Bild)19042.928; Lenovo Laptop; Outlook/Word 2016; Google Chrome...(is there more?)].

I wanted to post this problem in support.microsoft but I can't sign in (which is the core of my problem, only a bit more confusing than this), so thought one of you wonderfully knowledgeable angels might know for me what to do? :)

How do I fix an unending miserable confusion with Microsoft?
Don’t know why but I have several email addresses at Microsoft with which I became very confused as it’s giving me trouble in logging into Word, PDF, etc. Is it possible to please help me get rid of ALL these email addresses (and all passwords too?), keeping only one as primary and another as alternative and start from scratch again?

I'm now working on 4 Word/PDF pages (it already lost me one page!), and Microsoft won’t accept my login to save them no matter how many different ways I tried. As a result, not wanting to lose these pages, I have to leave the computer on constantly, to keep these files from disappearing.

I’d be so very grateful to someone to please take me out of this unending misery so I can start from scratch with the right email addresses and passwords and can continue with my work. It may have to do with the double verification, or that I don't like Edge which MS is trying to trap me into...I tried fixing it myself but it only got me more entangled and couldn’t get to sort and fix the problem.

Anticipating my BIG THANKS to someone for help, so I can start anew with Microsoft! 😊