Change domain name

Since you’re using WordPress, I recommend to set up your .com domain as a new domain and then move the domain name to it.

The first step is to add your domain to your account:

How to add your own domain to your account Domains and DNS

While a free subdomain is a great way to get started, a website looks a lot more professional with a custom domain name. Fortunately, you can register your own domain name with an external company (like Spaceship) and use it on InfinityFree. Adding your domain name to your hosting account To add your domain name to your hosting account, you first need to have a hosting account. Even if you only want to host your own domain with us, you’ll first need to create a hosting account with a subdomain,…

The second step is to move your website to your new domain:

How to move a website to a different directory File Management and FTP

Every website is linked to a certain htdocs directory on your account. But sometimes you need to move a website from one htdocs directory to another. This may be necessary if: You are moving to a different domain name (e.g. a free subdomain to a custom domain). You have recreated your domain name and it was assigned to a different directory. Fortunately, there is no need to rebuild your website from scratch. It’s not difficult to move your website from one directory to another. How to move a…

Since you’re using WordPress, you’ll also need to update your website URL. WordPress has information on how to do that:

WordPress Developer Resources

Changing The Site URL - Migrating WordPress – Advanced Administration Handbook |...

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Once the website is fully migrated to your new domain, you can choose to either remove the free subdomain from your account or setup a redirect to send all visitors to your .com domain.