Say it straight or don't say it at all.
If everything slows down when you step away, you've built something that depends on you, not something that runs without you. That dependency is a ceiling.
Adding more leads to a broken follow-up process just means more leads you do not close. Fix the system first. Then scale the input.
The leads are arriving. The problem is what happens after. Most small businesses are not short on leads. They are short on the system to handle them.
You do not need an outside consultant to see what is broken in your business. Most of the leaks are visible if you actually look. Here is how to do it yourself.
Almost certainly not. Most operators are too busy executing their processes to ever stop and evaluate them. That is how inefficiency compounds quietly for years.