A full diary is not evidence that a business is working. Most owner-managed businesses that feel busy and poor have an arithmetic problem, an operations problem, or both.
Busy is an input, profit is an output
When a business is busy and still not making money, the instinct is usually to sell more. That works only if the extra work is genuinely profitable. If it is not, more volume makes the problem bigger and hides it behind cash movement.
The first job is to separate the two possible causes. Either each unit of work is priced below what it actually costs to deliver, or the work is priced sensibly but the business burns too much capacity delivering it.
The price side
Price problems are arithmetic. Direct costs, labour time at a real recovered rate, overhead absorption and realistic utilisation all have to be in the same calculation. Most quotes fail because labour is costed at pay rate rather than recovered rate, or because overheads are spread across capacity the business never actually sells.
The operations side
Operational problems show up as rework, chasing, duplicated data entry, approvals that sit waiting, and work that only one person can do. None of that appears as a line in the accounts. It appears as hours, and hours are the most expensive thing in most SMEs.
This is why I diagnose before recommending anything. Cutting price, adding staff or buying software before you know which of these is happening usually makes the position worse.
What to do next
Run the arithmetic first, because it is cheap and fast. If the pricing holds up, the problem is in how work moves through the business, and that is where an operational review earns its money.