How to restore a website if data is corrupted

So, my site got messed up due to DDoS attack due to which I had to uninstall and install MYSQL again. I found that it isn’t wordpress database and the backup which I have is corrupted one and another backup which I have is from March’22. But now my backup is in .sql while it needs .ibd format so I can’t transfer these backup directly from SFTP.

I tried doing it from CLI using following statement:

mysql -u your_database_user -p wordpress -h localhost < your_backup_file.sql

and this was the output:

$ mysql -u root -p wordpress -h localhost < db.sql
-bash: db.sql: No such file or directory

$ mysql -u root -p wordpress < db.sql
-bash: db.sql: No such file or directory

$ mysql -u root -p wordpress -h localhost < /var/lib/mysql/db.sql
Enter password: 

So, after entering the password isn’t showing any output. I’m using droplet’s root password. Or do I need to use the db_password from wp-config file?

I also did this in a new droplet but I’m getting same error for the transferring database.

In 1 case I the data was transferred but I got this on homepage

There has been a critical error on this website.

Please help me out

Thanks!