Hi, I would like to make a suggestion for your website.
Design
~ When it comes to the UI, I really don't like it. The colors, and also the fonts. Its like you're having a Christmas party everyday there, why don't you try a Flat Design or maybe Material Design, try to catch up with whats popular today and change everything, I mean everything and I'm sure this will attract more players.
~ Your website should become responsive, and should fit in mobile phones and tablets.
Games
~ It's good to know that you have four kinds of games there, but please, add 1 more game and I suggest is Dice, dice games are more popular than any other gambling games here.
~ Hire a moderator and make a small games like lotteries or maybe some chat games.
Chat
~ Want to make it more lively? Put a tippy bot there, this bot will tip those who are active in your chat. If someone deposit 100k and above and chatted in chat room, he has the chance to receive more tip from tippy bot, let's say 20k sats. And if someone is actively chatting in the chat room but didn't deposit, he has the chance to get maybe 2.5k tip from tippy bot. You can also add emoticons and flags (chat room) there for English Players, Russian Players, and so on.
Cryptocurrencies
~ Instead of Bitcoin, add more cryptocurrency there, maybe 3 or 4 more cryptocurrency, just pick what cryptocurrency is popular and also if a player wants to convert it to BTC, you can add this feature, just like in shapeshift.
Other suggestions:
~ JACKPOT (Put a 1 rare color in Plinko, and this block will be a hard to hit maybe 0.5 chance to hit this, and if the player hit it, he will win 1 BTC (to win a 1 btc, a player should bet 100, 000 satoshi * 1000 and he need to hit that block), well it depends on you on how much you will give the reward.) You can also add this in slot, roulette and bit spin if you want.
~ Facebook, Twitter integration, a player will share his winnings and his referral link will automatically share also.