How to convert the Voltage source into a Current source
I think you can convert the L/C/R2 network from a star to a triangle.

You can then further simplify the network.  You get an impedance in parallel with R1, one in parallel with the current source and one in parallel with the voltage source.

The latter impedance can be "ignored" (except if you need to determine the current provided by V, but you can add it later).

You then have an impedance in series with the voltage source.  Etc.

I hope this helps.