You could make a second army if you have the money to spare. If you like the Tau playstyle, the fluff, the models, etc. that's completely okay.
I question whether that is wise if you solely want to mix things up, however. You can use almost every model in the Elysian list with the regular Imperial Guard rules, and at the very least 95% of your infantry with the Armoured Battlegroup or multiple DKoK rules.There is a lot more that you can explore just with the models you own, before even needing to make a second army. I'll be using the IG Codex, the Elysian list, and one or both DKoK lists with my IG models, and maybe even Armoured Battlegroup if I feel like buying a lot of tanks in the future.
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