You can absolutely do that. If you want to upgrade to a paid plan to get some of the features you want, then you can switch at any time through the My Products option in your account or with the help of a GoDaddy Guide. Once you upgrade your site will have all the same customizations and work that you've already put in place, just with the added features. See Website Builder plans and pricing for more info.
Full Disclosure This post may contain affiliate links, meaning that if you click on one of the links and purchase an item, I will receive a commission (at no additional cost to you). I will never accept money from a company to promote them. Every tool, software or company that I write about on this blog is personally tested and used by me, and I will never link out to a crappy product that's not good only to make a quick buck.
How to Choose the Perfect Domain Name for your Local Business
There are more than a hundred free website builders available online, and new ones keep popping up every year. According to my research, the percentage of sites developed using online website builders (including free ones) is catching up with the percentage of websites built using popular CMS with open code as WordPress, Drupal, Joomla, Magento and the like.