I'm the highest level support you can possibly get at one of the largest web hosting companies, so I like to think I know a few things. A few things about the tech anyway. Toddlers can out design me any day.
It looks like you are on Wordpress 5.4.9 using the built in twentyfifteen theme.
I would stick with Wordpress, performance and customizability are good and it does not lock you to a provider.
It appears you have cPanel hosting with A2. I'm not familiar with the access they give, but as long as they are not restricting it I recommend you log in, make a cPanel backup, and download a copy for safe storage. Once you have done that, upgrade Wordress to 5.9.x and look into a new theme.
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I would recommend trying a popular theme on the Wordpress site, not a random from a google search. Too many sites out there that offer "free" wordpress themes that are really just pre-hacked themes.
As long as A2 allows you to make a full account backup and you have that in a safe location, you can go crazy on your site. Even if you destroy your site, that backup has everything needed to restore it. Just make sure it is not a skip-home backup. To be sure you can check it after downloading and your site files will be in extractedBackupFolder/homedir/public_html with the database at extractedBackupFolder/mysql/