Rental Rehap/Repairs

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I bought a single family rental 8 months ago. The tenant of 8 years has signed a new lease. The house was in need of numerous repairs. I replaced the roof, put some new flooring, remodeled the bath, and painted outside.
Most of the previous repairs were really needed. My question is, should I continue to get the house in better shape in case I need to have it ready for a new tenant? This may also help keep the current tenant, or should I follow the "if it aint broke dont fix it rule?"