Why am I working 70 hours and still behind?
Because hours do not fix ownership design. If the business still routes important decisions, exceptions, corrections, and quality control through you, more hours just make the same dependency more efficient.
Hours are a tool. Decision-routing is a structure. A tool cannot fix a structure.
The deeper issue
The business has not separated what only the owner can decide from what someone else can. Until that map exists, every decision defaults to the owner. More hours just absorb more defaults.