I'm afraid not. Once your plan is activated, the expiration timer starts counting, even if you turn off data or your eSIM on your device. Your plan activates when it connects to a network in a country covered by the plan. If you're buying a country-specific plan, you can buy before or when you arrive in the country. If you're buying a regional plan that includes your current location, the expiration timer will start when the eSIM is installed and connects to a local network.
If you need more time to activate the plan, send a message to our Contact Center at help@gigsky.com, requesting that we cancel the plan. You can then repurchase closer to the time you need it.