If you're slacking on water changes you might need a better system for doing them. Here's a few things to consider...
Are you trying to do water changes on your tanks on the same day? If so, spread the work out. Do two tanks one day, two tanks the next, etc. Putting a huge workload into a smal time frame is a great way to lose motivation. A saying I keep in my mind always: "start small, go far". Little efforts accumulate into big results, as long as those little efforts are consistent.
How do you do water changes, and how big are your tanks? If you're just scooping the water out, or using a gravel vacuum, then you need a faster, easier way to maintain tanks than that. When using a gasoline transfer pump started getting to difficult for maintaining all my tanks, I switched to a 400gph pond pump. Water transfer is so rapid that it takes 3 minutes give or take to do a complete 50% change on one of my 10 gallon tanks. This obviously won't help you if you have tons of small tanks, and if that's the case then I'd tell you to sell your small tanks and upsize to larger, divided tanks, because they take way less effort to maintain.
This is the pump I bought to do water changes. I highly recommend it:
(If you do decide to buy a pump, always check the pump's maximum lift height, or otherwise called it's H-Max. This represents how much power the pump has for pushing water upwards. If the H-Max is to low, you won't be able to pump water back into your tank. The above pump has a 7 foot h-max, so it's great unless you've got tanks sitting on shelves at above 7 feet for some odd reason).