How to Change Standard Account to Administrator Account Using Terminal on Linux Mint

How to Change Standard Account to Administrator Account Using Terminal on Linux Mint
𝗦𝗵𝗼𝗿𝘁 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: In this tutorial video, we'll demonstrate how to change a standard account to an administrator account using the Terminal on Linux Mint. Having administrative privileges allows you to perform various system-level tasks. We'll guide you through the necessary commands and steps to elevate a standard account to an administrator account using the Terminal. By following our instructions, you'll be able to gain full administrative access and unlock additional capabilities on your Linux Mint system.
▶ How to open the terminal prompt?
Press CTRL - ALT - T
▶ Log in with your user account name and password.
➤COMMAND:
✔️ sudo usermod -aG sudo username
⚠️ Replace username with your user name.
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[@merlinof2]

OK, looks good, however did not change the account type for me.
Situation:
Running Linux Mint 21.2
Installed Google Remote Desktop
It removed all privileges, my ability to install s/w, my ability to recognize flash drives, etc, ability to run upgrades. could not boot to desktop without special sequence.
** special sequence, start computer, login screen, input password, would return to login screen, CTRL+ALT+F1 = terminal, input username/password, startx CTRL+BRK = desktop
checked User Accounts in Control Panel, user type showed as CUSTOM, not Standard or Administrator (cannot do anything in GUI Users Account except change Name/Passwd)
removed Google Remote Desktop
mostly functional, but limited privileges, (no s/w install, no flash drives, no updates)
re-installed OS. (system has separate /root + /home partitions)
same situation existed, no change
ran the above command. was able to update system at least, still cannot install new s/w or recognize flash drives
checking User Accounts in Control Panel, user type still showed as CUSTOM, not Standard or Administrator
grasping at straws now..
any suggestions?