How do I delete my account and all associated data?

Account deletion is under Settings > Account > Danger Zone — it requires typing your account/workspace name to confirm and is permanent once processed (contacts, campaigns, and sent history are all wiped, there's no recovery window after confirmation). If you might want to come back later or just need a break, canceling your license without deleting the account keeps your data intact but paused, which might be worth considering instead if you're not 100% certain.