There are different projects to address in your home. Some are upgrades and some are maintenance. The maintenance projects are often not as glamorous but still very necessary.
What if your furnace is kind of at the end of its useful life or maybe the air conditioning unit is going, these are things that have to be addressed. Your sump pump might not be up to the job anymore, you have no choice but to invest in a new one. It's not enough to do the pretty things in your house, you have to maintain the mechanicals of your house. That will also help you sell that house when you're ready to put it on the market.