I made it!
PS: I doubt I'll get to 9999 anytime soon
Nice, well done! In case you don't know, though, you go up levels massively slower after 1000, so it doesn't take 10x as long to get to 9999, it's virtually impossible to get to 9999 with any sane amount of play.
On my main account, Steam says I have 581 hours, and I'm at 2014. Just collected my 150k follower summit reward and did the 2 summit events to get another 400k followers. Got me to 2027.
On an account I only recently started playing on, I did the same. Started at icon 124, got to 175, so that's 51 levels vs 13, so it's around 1/4 of the rate of gaining levels after 1000. I'm not 100% certain how it works, but I think it might just be a straight switch in rate of gaining levels, i.e. one rate up to 1000, then the lower rate after 1000.
The boosted rally raid set for gold this week is worth getting, as Bayou Break with that set is the best money earner in the game, assuming you don't have the same boosted set for hypercar.