Why do you want to diversify? To make more profit? Because you are getting bored of hold 'em?
If you want to profit more, you should stick to your best game or completely switch over to a softer one that you can dominate, then stick to that.
If you are getting bored, then sure, try a few other games. Pot limit Omaha Hi is a good one to try if you want something similar to Hold 'em but with a little more action.