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i don't know how to play blackjack, so i decided to learn (to be honest whenever i play card games at my house with my family i always lost, it seems like i'm not very lucky with card games) and i must say that it's being fun this learning. your website has a very practical and beautiful designer

I guess in blackjack you have better options than just wagering contests.
For example you can offer following promotions:
1. Collect blackjack 10 times and get a chance to take part in our daily wagering contest. The more blackjack you collect, the higher the chance to win.
2. Win 20K (example) USD with four suited 7s.
3. Wager $10 and get $30 welcome bonus.
4. Bonus cards during game.

I guess there are some good options out there.

Wagering contest on blackjack game only is a rare competition so you can start it to know how the interest from players. Small bankrolls get less chance here for wagering contest since it is a blackjack game where they cant do autobet with small bet like what they can do on dice game or other games with autobet.
I would support the suggestion by shield above to be honest, competition which is not a wagering contest. As an alternative you can do profit percentage competition. The winner will be the one with highest profit percentage (not the amount), so it is something like how much is wagered compared to how much is won.

There is also a group blackjack thing that could make things a lot more interesting. One of the reasons why blackjack gets so much attention in the casino world (in real life) is the simple fact that there could be 5 people who are playing all at the same time, some busts while others get 21 and some just ties with the dealer and so forth, so having online version would make it a lot more interesting.

I know in coding world that would be quite difficult to do, I am sure it would come with a million different troubles if you want to do it and you have to fix all of that and find a way to make it both provably fair but at the same time have the house edge and still make a profit for the casino, that is why I think this should be down the line type of thing and not urgent, but surely would be great addition.

Nice idea, it remains me to a game in online local casino but not a blackjack game but still a card game where there are some players plays against dealer. Even a player can be a dealer, of course there is a minimum bankroll to be a dealer so there is a guarantee that player who become a dealer can pay the players.
I dont think it is that difficult to make since I can find so many sites offers similar games here in my country. The only difference is about ythe game. Would be nice if blackjack will be able to make it in the future, at least make it like what you think. No need to add a feature where a player can be a dealer.

Blackjack is probably the simplest game that you can play in the gambling world, it is literally just hit 21 or beat the other persons card total numbers before you bust out. If you go over 21 you will lose, if you do not go over 21 but do not reach 21, you hope that the other person stays under you or go busts, or you hope for 21, many places have extra profit for hitting 21 straight up (but not generally for hitting 21 after asking for a card).

So that's it, if you just watch a video of it for like 10 minutes you will learn every single thing you need to learn about blackjack and then some. Plus if you play it few times you will get it as well. I love it because of that, it is quite simple and it is still quite entertaining to play it as well.

I don't know if there's a video tutorial on how to play blackjack if you didn't have it much better if you create a tutorial since many people still doesn't know on how to play this and I'm sure the video tutorial will help newbies to learn on how to play the game.

Anyways it's just my two cents its good if you have it.

I have an idea for a wagering contest, but it might be difficult to implement. Instead of doing blackjack against the house, do a Player vs Player BJ so players just play against each other. Someone will win or lose or draw. And first to get 100 wins progress to next stage. Until final stage, one winner wins the big prize:)