The issue is not WordPress installation. The website is up & running but cannot perform any action for example adding new posts. The actual issue is database. I don’t know how to create it with required tables.
So guys I have found the key & it seems that is the only way.
I tried everything, but none worked. I even imported a database, which too failed. Finally, I created a new account inside Infinityfree(it allows 3). That worked!
Just for reference, I had earlier assigned a weak password. It got hacked, and then I had to remove everything but it only created problems afterwards even with the fresh installs. So, if someone’s website gets hacked, simply deactivate & remove the account inside Infinityfree & create a new one.
Thank you guys also for taking time in pursuit of support!