Stuck in macOS High Sierra
I tried to update my MacBook to the latest update (Big Sur). This did not work, my computer totally froze and I had to delete my old account. When I did this I chose to restart my computer by reinstalling macOS High Sierra. I was happy when I got my computer to work again until I realized that I can't do a new software update to OS Mojave or OS Catalina. This means that I can't download apps like Word because my current OS High Sierra doesn't allow it.
So my question is, how can I update my OS High Sierra to a newer version, when no updates to a new software can be found at my computer?
I'm so thankful if someone knows how to help!
MacBook