It's really not worth it to try to go for the next level artificially. You should just play your normal games and when you get there, you get there. Here's the math:
You need 500k wagered to get from gold to plat 1. You're 29% of the way there. That means u need about 106,500.00$ wager to get there.
The absolute lowest house edge game has a 1% edge. Which means that you need to LOSE $1065.50 to get to plat 1 from where you are now. Now, that's EV loss obviously but that's what counts. The only "safe" way to assure you'll get to plat 1 is to play in a way where you lose essentially exactly that amount, because any other way you could potentially lose far more (or, of course, potentially lose less/profit).
So the only good strat would be to deposit $1065.50, go to dice, bet 2x on $1, auto play for 106550 rolls and go take a nap. Once you bust your deposit you should have enough rakeback to get you the rest of the way there. You'll get a $500 bonus, plus some small % lossback probably totalling another few hundred, give or take, plus a small reload for a couple of weeks. You might gross $500-$800 which is a net of $150-$250. Goodluck.