Operations during a growth spurt
Growth breaks the operations that worked at the smaller size. Plan for the breakage, don't be surprised by it.
Add roles before the breaking point
Office help, lead techs, second crews. Bring them on slightly ahead of the load, not after.
Re-write SOPs at every size jump
The SOPs at 5 don't work at 10. The ones at 10 don't work at 20. Plan to rewrite every couple of years.
Slow down the sales channel if needed
Sometimes the right move is to throttle inbound while operations catches up. Selling more than you can deliver is the fastest way to destroy a reputation.
Take your version of this question further
This is one operator-tested angle on the question. Your shop, your size, your trade, and your team change the answer. Ask your specific version inside Ask a Shop Owner to get a response grounded in how owners like you actually handled it.