Yes, electronics have improved over the years.
However, to benefit from such, it may take you well outside your established price point to see/hear a noticeable improvement.
I also agree that slight adjustments make more sense to me that huge large scale upgrades.
The TT arm and cartridge for instance. The DAC. DAC technology has greatly improved and you can find some really good used DACS on the market.
But, if it were me, I would listen to what I have and enjoy. When I hear something that isn't satisfying, causes listener's fatigue, lack of space, etc. I would slowly go down the one item at a time upgrade path until I am at a point where I am happy.
I coach high school track and field also and I always tell my athletes that there is always someone better, faster, can jump higher, etc. So don't get caught up thinking and believing that you are the best. Maybe on that particular day you were, but...
In the case of audio equipment, there is always something out there that is better. However, to get to that point may cost a ridiculous amount and (depending on the person) may not be worth it.
Listen and enjoy and go one step at a time.