What I'm saying is to use savescumming - saving before a random chance event and loading back to before if the outcome isn't what you want.
casino.ic is a website on the computer in the player character's room, just put the link in like normal, buy some tokens, and save the game. Then, play blackjack betting all your tokens, and if you lose, load the save before you played blackjack. when you win, save the game. then play blackjack again betting everything. Repeating this, you'll never lose.
After reaching a couple hundred thousand tokens, and you can't bet all of your tokens on blackjack anymore, sell the tokens, and go on stonks.ic. Save the game right after putting all your money into a stock, then sleep for 8 hours or more, check the stock you bought, and if it went down, load the save and sleep again, check the stock, and if the value went up by a decent amount, sell all, then save the game. and, repeat.
Editing the save file will work very easily unless the developer decides to encrypt it; use something other than plain text, but otherwise just save a file to disk (download onto your computer), open it, then press command + F , the shortcut for find. Then type in money, and it should find places where money is written in the file. Read around, and change the one that states the amount of money you have to 888888888 or something. If it's too high, it'll change to 0 though.