Today me and @BloxVurse launched our game crafting simulator as shown here (we did a soft release a few days ago to research bugs and gain basic feedback) š YOUR WORST NIGHTMARE! - Roblox
However we are having issues getting into the thousands and therefor onto front page where we can really explode.
What we are doing:
We have ads running
we have sponsors on mobile, tablet and pc
we have a popular youtube promoting our game
as much advice as possible would be appreciated 
Honestly I would just say that you need more Robux to spend on ads and sponsors. Other than that, there really isnāt much you can do besides change around the actual game to improve retention. One thing you could try would be to make a code that you have in your title that gives you a quick start to the game. That would help improve retention without much work. Hope this helps.
Generally speaking, promotions like ads and sponsors donāt meaningfully affect your player count. They are really optimal for boosting a game thatās already gaining traction.
You already have 600 concurrents so your game clearly doesnāt suck. Thatās good, because making a game that doesnāt suck is the hardest part.
For getting to the front page you need to focus on session length. The longer players are in your game, the more players will join. Pay attention to pacing - constant intense action is just as boring as nothing happening at all. Players will lose interest unless you find a way to break up your gameplay with additional elements. Lots of games do this by offering alternate ways to play (jailbreak) or by combining two basic games that complement each other (bloxburg). Action games (mm2) do this by making the game round based and giving you specific instructions each round.
For staying on the front page you need to focus on returning users. Offer features like daily rewards or timed events to keep players coming back.
Itās a little overambitious to be expecting to get onto the front page within your first day of releasing unless your game is simply that good.
Give your advertisements and knowledge of the game some time to set in, then come back if it isnāt working. By creating a post on the same day you launch and talking about how you havenāt reached front page, you demonstrate that you havenāt given your stuff time to set in and observe its workings. Itās impatient.
We did a soft launch a few days ago and picked up about 20k plays this is more of our official launch
Would help to clarify that from the get-go (please edit your post). I didnāt want to make any far-fetched assumptions and remain realistic, so I took your post contents at face value. This changes my response completely.
I donāt have enough battery life to type something focused but one thing I will plug here is that you will often hear back on retention. User retention, experience and first impressions are absolutely paramount. Leave a lasting impression on the user that beckons for their return. There are many ways to accomplish this of course, depending on your game.
We have 100% taken your advice to heart and brainstormed a few ideas. our current central one is every 10-15 mins a 5 min event takes place which double Coins/ Xp/ Speed for 5 mins. do you believe this would be effective?
That sounds like a great starting point!