Yea, as people said it already here : Lottos, paydays aaaand also gamblings.
But, the fact is that there are always new players that own the well-known high-rated properties and that's cause it's hard to maintain your stats at that level. Therefore, I suggest you something : Don't put your wishes on lottos, the luck doesn't have too much friends. Do not gamble, as many of the people here told their story about gambling, you will loose it back at casino cause that's root of evil, the thought "I can be richer" will get you back to poverty.
Also, earn drugs, not necersarily kilos but imagine, 200-300g weed can give you up to 10k.
Last but not least, don't be just on making money, play without this thought and it will be easier to achieve, this is a psichologic law.
PS: Get property ideas and rp business ideas, if you eye a profitable bizz you can request a loan and get it, I did so with Chuck n Luck casino and it's going on very very well but Im never gambling.
Best wishes,
Catzu Ancelotti