To get a WR,as everyone said, you need time,motivation,and perseverance. But personally I didn't even need the 3rd point. I'm not that perseverant anymore,I can't play 1 track during more than a week,I feel like if I'm focused on 1 track during a looong time I'd probably lose my lines on others or even my item gestion.
To get a WR too,I was playing around 8hrs per day,even when I was nervous,I was taking risks,more than without nerves,just because I really wanted to be sure that I got it,except in some cases where I didn't see it coming. It didn't seem to be that good ( MP, rDKP ) or I was just way too nervous and thought I actually failed a part at the last 2 seconds ( rLR ). However,I never really raged,only RR7 makes me really mad.
To get a WR too,when I have time, I play without motivation,playing while being annoyed, but I somehow still get a PR,it just depends of how I play against my ghost.
But after I get a WR,I'm just like " fuckyea " and that's clearly it. Not crying or something,just saying a little yeah, and I post the time. I also hate arrogance or try to help if I have a WR or if I am pretty good in general at this track,I'm just supporting,or trying to give tips.
You also said that you didn't get the rMT WR,but I'm actually pretty sure you still have less than 2000hrs on MK7,unlike me,I have around 5850hrs now. Really,I'm not talented at all. I just always think there's a ton of players better than me,that will beat me,even if I have a WR.
I hope you will get the TR WR one day,because everyone deserves to get at least 1 WR once. no matter the game and the date. a WR is a WR.