Yes, you can delete your card details from your account. However, this can only be done by Ubersuggest customer service.
Please email us at support@ubersuggest.com and ask our agents to remove your card details.
This can be actioned within 24-72 hours.
On the other hand, if you just want to change the billing info on your account, you can simply alter it on Account & Billing section, under BILLING.
For more information check: Payments, Billing, and Invoicing from Your Ubersuggest Account.