I agree, but how? Everyone I know uses WhatsApp. If I close my Facebook account I lose my only method of contacting a great deal of people who I used to know an

I agree, but how? Everyone I know uses WhatsApp. If I close my Facebook account I lose my only method of contacting a great deal of people who I used to know and don't want to lose touch with. How do I get off these platforms when no-one else will?