Well I'm a small child at 17 years young but I'll say the best thing for you to do is like look at classic games, tactics,openings,endings and you'll get to 2000 in about 3 years.
How do people get that good!

I see what you are saying, time, work and commitment. Finding pleasure in the game helps too. But I don't think I'll ever reach 2000.
I started late playing chess at 42 and Im 58 and never been much better than I was 16 years ago .
of course I just dink'd at it from work and starting playin 1 0 bec I didnt have much time to play a whole long drawn out game.
My best advice is dont play 1 0 if you want to get better

As we get older, our minds naturally deteriorate. However, what you can do is to slow the decline rate.
I keep trying but it seems that i level out at a rating of 1300-1500. I'm over 70 but that should not excuse. I can't imagine how chess players get to 2000 or even 1800. They must be very gifted.