Ad Group not spending budget for months

Hi everyone, I had a campaign with 3 ad groups, later on I have added a 4th one but it has never spent any budget for over 6 months now. I have tried adding negative keyword to avoid competition with the other ad groups but it still not running. Do you please have any suggestions? I really appreciate any help you can provide. Please check the screenshot attached. the 4th new ad group is a general ad group (the category service) while the other 3 are exact services

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