How do I become more tax efficient

Thank you!!! I do have an account done more information about me I have 5 properties on average I pay around 6 and 8k a year on tax after expenses deducted. For the past 10 years the tax bill has slowly increased due to more and more government rules. What my account does is add my daytime salary to the profits from the houses. It was the accountant that suggested the ltd company. This is all new to me so just investigating.