I am riding a 2008 bike and have upgraded over the years.
The best change was tubeless and light tyres.
The next was , and I never thought I would say it is 1x from 3x.
I don’t have a dropper post and never will for the cross country flat trails around Coventry. I prefer the less weight and simplicity.
Main thing is get out and ride and have fun. You can do that on any bike.