Recently went over 90,000 miles. What kind of things should I start looking out for?

2015 Prius here. I went past 90,000 miles a couple of weeks ago. One thing I have noticed over the last couple of months is it seems like my key fob battery is glitching. Sometimes it will recognize the fob and other times it doesn't. Once it starts to never recognize it, I replace the battery but I will still get the same thing every couple of days and then I can go weeks between any problems but the battery lasts only 5 months or so. I do have another key fob I can start using if you think that might be the problem or are the batteries just weak or is there something wrong with the car picking up the signal?

What kind of maintenance will be due soon? The only things I've had done in the 6 years or so I've owned it is oil changes and some new tires. What should I start looking out for or expecting to go wrong? I have googled Prius maintenance but it's mostly just general guidelines. I need the pros here to give it to me straight.