So the magnetic field strength increases linearly with both the number of turns and the voltage. The resistance of a wire is given by. $$ R = \rho \frac{l}{A}, $$. (where $\rho$ is some material property of the wire, $A$ is the cross sectional area and $l$ is the length) so that $LR = \rho Ll/A$ and.he number of turns can also increase the inductance of the coil and hence may lead to impedance, which also adds up with the resistance. Hence, I suggest the use of soft iron core, increase the current and voltage input, use a wire with low specific resistivity $\rho$ like silver or aluminum.
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