Level 60⭐ and S26, how can I win 1 GP?

I've come in 1st place in over 100 races now, won Mini-Prix, etc. However, I cannot for the life of me win a single GP. I just need to win at least once. Is there a trick to enter an almost empty lobby to get at least 1 GP under my belt and get the machine decoration that goes along with it? Thanks in advance. I've only been playing for a few months now, so I think many of you have an extra year experience than me since F-Zero 99 launched over a year ago...