Hi,
Simple answer, dont follow fixes on the internet that you do not understand or are not prepared to research until you do understand them.
The simples solution to loading a backup into any MYSQL database is to use the "MYSQL Console" and inport the database through that.
UNDO all the ill advised changes you made to `my.ini` and try using the MYSQL console
mysql> source path\to\file\backup.php
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-