Congratulations on the win mate, should feel good.
But as a real addicted man to casino I can advice you only one...
** BUY something for yourself instantly, because eventually you will lose most of that amount back to casino, that's how the greediness works xD
* Either BUY something, or just transfer the money to someone you trust really hard, idk, family or someone and let them keep the money for you, so you can't just sit home and in any moment be like, hmm... i can gamble a little bit. I mean, you can win more aswell, but lets be honest, that happens rarely af. I have lost around 7-8k euros within half year, and still have loans of 6k euro, trust me, gambling will lead to hole. I'm now working just to close my debts, loans etc. And next 1.5year I will keep working just to close all shit. So, enjoy your win and be careful, don't fk up!
Also, about taxes... I don't know how it works in your country, but in our, if you withdraw 2999eur each day, you don't pay taxes. Like total amount of what you withdrew within month doesn't counts, it counts only withdraw per transaction. So, take your time, read policy about casino taxes, government taxes.