The travel-focused credit card is ideal for you. There are many good options for you; Air India SBI Signature Card, Axis Bank Vistara Signature Card or HDFC Regalia. They have additional benefits like lounge access, reward points and gives you amazing discounts on flights and hotels. Compare all the features of these credit cards like features, fees and rewards and then choose the best credit card according to your requirement.

Transferring the existing insurance to your name is possible and recommended. To do that, contact the seller to get an NOC and deposit all the documents with new RC (issued by RTO) to the insurance company. Once the insurer approves, the insurance policy will be transferred to your name.

For your online store, even if your revenue is minimal, you may need to register for GST in India. If your annual turnover is below Rs. 20 lakh (In some states its Rs. 10 lakh ), you are not required to register for GST.
But as you mention, you are involved in both interstate and foreign transactions, you need to register for GST no matter how much business you do.
With your expected minimal revenue, registering as an individual (sole proprietor) with a GST number is advisable for simplicity and compliance with e-commerce requirements.
It’s advisable to consult a GST specialist who can provide personalized guidance based on your specific situation.