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This is a kind of broad question.
If area is not a concern then you can use a driving cell with high driving capacity.
Most of the designing tools results are specific to the coding style. Somtimes changing coding style may achieve better timing.
Could you tell me the exact problem:?:
First let the tools synthesize the design with higher effort, if it doesn't work you'll have to go back to modify your RTL code. To break the worst path into 2 parts by inserting a FF in the middle, or, just latch some signal before using it if the it's ok with your logic.
it depends on which design phase you are in. In pre layout phase, synthesis tool running with a high effort may resolve the prolbem, logic change can do it too.
If postlayout, you may need to move cells, sizing up cells.