A contrary view:
If you love your current bike and it serves you well, don’t worry too much about what you may be missing. Instead ride it hard until it dies.
I rode my Trek 5500 for more than 20 years. It finally gave up the ghost (bottom bracket shell separated from the bottom bracket housing) and I reluctantly replaced it with a new Madone SLR. (Thanks Trek lifetime frame warranty!)
Sure the Madone is a much better bike, but it’s taking some time for it to earn its place in my heart.