Can I modify my plan anytime?
Sure, you can modify your plan at any time.
You can easily modify your subscription by going to your account https://app.scrapehero.com/settings/billing and modifying one or all of your subscriptions or plans.
If you change your plan, the changes made are usually instant and you should be able to use your new plan limits immediately.
e.g. as an illustrative example, if you change from a plan for $5 which gives you 4500 data credits to a plan for $25 that gives you 30000 data credits, you will essentially be adding the new $25 plan to your account with the remaining data credits from $5 plan added to your account.