The only account on my macbook is a standard account. I need to somehow get an administrator account. How can I do that, and if I do, will I lose all my data?

I got my macbook from my dad a while back, and I tried to make me the administrator. But in doing so, I somehow activated a root user, and now my account (which is also the only account now) is a standard one, so I can not download apps, etc. How can I fix this without losing my files?

Option 1
If you've enabled root logins, log in as root and promote the other user to an admin.
Option 2
Boot into Recovery (command-R at startup) and restore your system from the last Time Machine snapshot taken before the damage was done, if you know when that was. Afterwards you can restore any data that has changed since then from a later snapshot. If you’re an advanced user familiar with the shell, there may be a quicker fix, but I prefer not to get into that.
Option 3
Back up all data, then boot in single-user mode (command-S at startup.) When the text stops scrolling, follow the prompts to make the boot volume writable. Then enter the following command:
ls /var/db/.AppleSetupDone
You should get the following line of output below what you entered:
/var/db/.AppleSetupDone
If you do, then very carefully enter the following command:
rm !$
Now you should get the following output:
rm /var/db/.AppleSetupDone
Then enter
reboot
The system will boot into the Setup Assistant, as if you were setting it up for the first time. Skip the prompt to transfer information. Create a user with the same name as the old admin user. Log in and test. You may need to recreate your other user accounts, if any. The files won't be deleted.

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