Living on less

So my job has become virtually non-existent during all these changes and my income will be at about 20%. I am hopeful my husband will continue to have consistent income, he is a small business owner. I don’t want any negative comments, just looking for any tips/advice on getting by on way less income. Me and my husband have sat down and made a rigid meal plan that has nutritional value but is just the basics in efforts to cut grocery costs. Any other insights on other ideas other than food? We are a family of 4