With HeyReach, you can edit ongoing campaigns.
Select the Ongoing campaign you want to modify,
Click the Pause button
Click the Edit
Changes that are allowed when editing an ongoing campaign:
Add leads to campaign - increasing the prospects in the list by adding new prospects list
exclusion filters - re-configure the exclusion filters
account setup - add or remove LinkedIn accounts to your campaign
account working activity - change timezone, working days, or working hours
connection request note - change message, change fallback message, add or remove message variations
messages - change message, change fallback message, add or remove message variations
delays between actions - modify time in delays between actions (removing delay is not allowed)
Changes that are not allowed when editing an ongoing campaign:
actions - you can't add or remove actions
delays - you can't add or remove delays between actions