Ask an Adviser - Budgeting To Reduce Your Tax

I own a rental property earning approx. $395 a week. My mortgage is $32K and I'm earning a minimum $835 fortnight for employment. I salary sacrifice 90% of my pay to a salary sacrifice credit card to use for general expenses. I'm a disability support worker so earn more depending on available work. I have $150K in an offset account. I want to reduce my tax. What could you recommend? I am thinking of renovating my rental - how much should i spend renovating/or is there a limit? Is this a good option?