Frequency of oscillation is determined by the sum interaction of all components in the control network.
No component can be allowed to stagnate.
Each component must charge via the current available to it. Stagnation is prone to happen if a resistor is too small, or a coil value is too small, or a capacitor value is too large.
Generally speaking, if you want a higher frequency, reduce values of the coils and capacitors. Leave resistor values the same.
A circuit lacking a crystal will oscillate at a rate determined primarily by the coils and capacitors. Secondarily by the resistors.
Oscillation occurs when you have sufficient voltage/current swing going on at the transistor bias. To reach this point you must first apply sufficient DC bias to turn on the transistor slightly. Usually 0.6 V. You're using a FET so you must modify to suit.
An FET is normally operated as a voltage-controlled device. Is the bias carrying current? If not then is there a current path for the interaction of coils and capacitors? This may be crucial to proper operation.
As to adjusting the oscillation frequency upward, if you want to obtain twice the frequency, you divide all coil and capacitor values by 2. This applies only to components in the control network.
What components make up the control network? Your schematic is not clear enough to make out, but you can locate a few strategic points to attach an oscilloscope, and watch for at least a few oscillations after you power up the circuit. By tweaking a component or two you might get better performance.