It seems like you're an admin who wants to see your site prosper and hopefully you're one of the smart admins out there. If you are, great.
I understand how your round had to end, the collapse of a ponzi is inevitable and people will eventually lose their money but when looking at the statistics I am a little surprised. First off, you've been running for only 20 days and you're already at round 4. That's quite the leap and a lot of money lost. There are ways you can prevent this.
I would recommend increasing the time limit to about 72 or 100 hours. It gives people a lot of time to think about their deposit and allows the website to gain traction. Also, you should really lower to maximum deposit to something less expensive. Now, I know the maximum is only 0.2 btc which is not a lot but for sites like yours, which pay very quickly (24 hours), that is a very hard thing to achieve. One of the reasons you've collapsed again is because you have a couple of wealthier people depositing 0.1 and 0.2 occasionally while everyone else is depositing smaller amounts like 0.01. I think your website is strong but there aren't enough people who'd deposit 0.01 x 20 in 24 hours. And if there were, you'd now have 0.01 x20 to pay out.
So if you lower the maximum payment to something more bearable your site will last a little longer. I also noticed that you take a 0.0005 btc commission fee per transaction. To be completely honest this is the largest fee I've ever seen on any ponzi but trust me, that is not a bad thing. It's just what you use that fee for that matters. What I recommend is using this fee as a backup. Think of it like a retirement fund. You take a portion of each pay cheque over the course of your life and either invest it or just keep it safe for when you need it. You should do the same with this site. 50,000 x 166 = 8300000 satoshi is the minimum you should have earned from fees. I know you need money to pay server costs and for yourself but you should divide this money (or use it all entirely) in cases such as these. Not sure how much you're paying for server and domain but when I had a website I used a cheap one for about $7.00 a month. Again that was cheap but if I were you I'd take 0.01812 btc out of that to pay for the server and then allocate the rest for emergency collapses.
This fee thing won't work now because there are "high rollers" with 0.1 and 0.2 which makes it much harder compared to if they were lowered by a lot. It could recover the majority of payments in the future though. You can also invest it in other alternate currencies such as CLAM or DOGE, even Ethereum as they have all had major gains these past few days. (Although if you're not into risky trading then don't bother
)
Maybe these things will work, maybe they won't. Either way I just wanted to recommend some things for you as you seem fairly legitimate and perhaps understand that running a ponzi can earn yourself extra cash by leaving it online vs taking it down. Hopefully this helps.