Realistically you either gamble alot and receive RP all the time that way or you receive RP because you entered one of the FUN premium token tiers and get free wheel spins that way. I did used to win 5k RP from the free newsletter spin so there is that as well but that requires alot of luck and I wouldn't expect 20x times that luck in the next year or even two.
I think thats one of the good excuses to utilize the FUN token because its way easier to collect RP that way. I can remember getting 20k lotto tickets 1 week just from wheel spins or similar but I believe the possibility is equal for RP and I'd rather have the RP.
Or you have been here for a long time. I do not gamble too much, quite low amount and also do not have too much fun token neither, not any that matters at least. However I have been here since they had tons of ads all around the website, it has been 5+ years or something if I am not wrong. It wasn't like this of course at first, but gradually it grew and grew and grew and now I have nearly 90k myself as well, without doing much.
Only because it has been years, when you are here for years then you get used to these things and they do not become really a challenge, it just becomes a side thing that you get without really working for it. If I worked on it, I would have made so much more, yet I felt like the point of RP wasn't to grind it, it was to enjoy the website and on the side you get that without really focusing much into it.