To what end? You seem to have a solution (or are coming close to one) already.
1. Use a better initial condition. What did you use as your IC for this run? Using a previous solution with minor changes in boundary conditions or small geometric changes will tend to converge faster.
2. If you are simply trying to drive the residuals lower, try moving to the coupled solver. Once you have a semi-converged solution transitioning to the coupled solver may help drive residuals down faster. The down side here is the time per iteration will be longer, but the number of iterations necessary to get to the same level of convergence is often less.
3. There is always the choice to increase the relaxation factors. The down side here is if you increase them too much the solution can diverge on you. The support here will probably tell you to avoid this one.
The number of iterations is not important. What we typically care about is the wall-clock time. Are you running in parallel and matching the number of cores to the processes used by Fluent?
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