The preferable method would be to search the brand and model number to see if you can find detailed information from the manufacturer. You could also contact the manufacturer or a sales outlet for the manufacturer. The web sites of capacitor sellers sometimes have tables of typical values based on power, voltage and frequency ratings. Using a typical value should be adequate, but might have a small effect on motor performance. Check the motor current after replacement and check to see if the motor comes up to speed without too much delay. Check to see that the motor does not get too hot. A problem with the motor could indicate either the wrong capacitor value or a failed motor, more likely a failed motor.
You have 16A MCCB. Safety regulations require that you can only use 80% of that, which is 12.8A. So no matter the single-phase math, you have to do something different.
If I put your single-phase numbers into rapidtables I get 21A. 7A is the three-phase calculation. Hence my comment:
The only real answer is replace the single-phase motor with a three-phase motor.
Apparent Power
$$pf = \frac {P} {S} $$
$$S = \frac {P} {pf} = \frac {3,700W} {0.8} = 4,625VA $$
Means a single-phase current of:
$$I_{Phase} = \frac {S} {V_{Phase}} = \frac {4,625VA} {220V} = 21.0A $$
So maximum CB is 16A, safety is 12.8A. You cannot supply power to your elevator using a single-phase motor.
Three-phase power:
$$ P_T = \sqrt {3}\ V_{Line}\ I_{Line}\ cos\ \theta$$
$$ I_{Line} = \frac {P_T} {\sqrt {3}\ V_{Line}\ cos\ \theta} = \frac {3,700W} {\sqrt {3}\ \times \ 380V\ \times\ 0.8} = 7.03A$$
Under 12.8A.
At this point, the best advice we could give you is consult an electrician. If you have three-phase power available, it is always best to use it.
Best Answer
You don't.
A device designed to run from three separate phases, each 120° apart, is unlikely to work with a single phase. Even if it is possible at all, trying to "convert" it would require intimate knowledge of the device and expert-level electrical engineering skills. The nature of your question implies you have neither.