In GrooveKart Lite, from the menu choose Configure Checkout
Click the Cog ⚙️ icon next to each option to customize those elements such as the text on buttons, the scarcity timer, disable the phone number field, set the default country and more.
Add Authority to your page
You can enable the Credibility & Reviews sections to give your customers more reasons to buy when they are checking out.
Click the Plus ➕ button to add a section, for example I've added a Moneyback Guarantee: