I also thought that by getting the bonus, my chance to win would be more so I tried to get the bonus. But in reality, instead of getting the chance to win, I only increase the number of defeats

Besides that, the bonus will always come with the applicable requirements that we must obey so that when we can win, we can withdraw the money. We must be wise in responding to the bonuses the casino gives so as not to use more money to gamble. And if someone can enjoy responsible gambling, he will get pleasure and try to prevent great losses by limiting the use of money to gamble.
I have also fallen a lot when it comes to bonuses, on the contrary, when I realized what I had to do to be able to claim the wow bonus, I lost everything, my deposited money and the whole bonus, because there were already many associated things, 40x wagering requirements and it was something almost impossible, so at that moment I did not enjoy it, nor did I win, but I lost in the worst way, it is for such a reason that I never take the bonuses, a decent wager should be at least 1x and that's it, I For the word bonus I have another type of concept, but in casinos it means something else.
You need to realize what you are accepting in order for you to adjust and to try some luck to meet the requirements, if you are not ready to work on it better not to accept and let your usual routine inside gambling house, for you to enjoy your stay and not to regret whatever mistake that you made.
It's very important that you are well aware to what you'll going to take and willing to gamble with additional risk for the best benefits in case the outcome will favor your side.