Yes, you can select a different plan at any time.
However!
It’s not technically possible to switch between subscriptions without losing the $1 deal. For example, if you initially chose the Base plan for one dollar, you cannot switch to a different plan at the same $1 rate—you would need to pay the full price for the new plan.
To change your subscription plan:
Login to your Supliful account.
Go to the Supliful dashboard on the left, and find Settings tab.
Then go to Billing -> Subscriptions and click on the "Change plan" button:
On the new page click on Select under the subscription plan you want to switch to and then click on Continue:
Stripe will automatically calculate the amount that was already paid and used for the previous plan and extract the unused funds from the new plan price:
Click on Subscribe and Pay, and the new subscription plan will be applied to your Supliful account right away.