It's nearly impossible
Some time ago I was approached by a dentist for advice on how to grow a branch practice.
The dentist in question had bought a once excellent but now very run-down practice and was wanting to get it firing again. A good goal. Very definitely achievable.
But, the way they were going about it made the task of building nearly impossible:
The dentist was only going to be there occasionally when a patient booked in.
The practice was going to be understaffed to keep overhead down.
The phone was going to be answered by an answering machine much of the time.
Necessary renovations were being deferred to minimise costs.
If I were a swim instructor it would be like a client saying: "I want to wear a 20kg lead weight. Now teach me to swim."
Superficially what the dentist is doing makes sense. They want to keep an income stream going while they create a new one. But what they're really doing is killing the growth potential of the newly acquired practice.
Commitment is what this dentist lacks.
There is something magical about committing 100% to a practice. It focuses the mind in a way that is magical. But, if you treat a practice like a sideline or a distraction or a hobby it cannot grow.
About 15 years ago a dentist set up a "hobby" practice just down the road from me using the same flawed thinking as the dentist I mentioned above. It failed in less than 2 years while, simultaneously my practice went from strength to strength.
One of my daughters uses an expression that fits exactly the advice I'm trying to give you. It's worth pondering:
"Go hard or go home."