You're playing in a pay to earn game and the developer can force to give a change to the game anytime as they want. So many bots played adventures forced the developers to remove the adventures from the game. I have seen that since that day people are only focusing to earn from the arena but again the price of SLP is so low. You need to win every battle to get decent amounts of SLP.

The success of a game is not too important. The success of a whole in-game ecosystem and the health of its in-game economy are more important. Because no matter how good a game is, it can not attract new gamers forever at a same growth rate. So whenever the growth rate decreases, it will bring negative effects on in-game economy if it mostly relies on linear user growth rate in order to balance the in-game economy.
This approach is unsustainable so that Axie Infinity team are trying to do something to change and fix it. As observers, we can see the growth of Axie Infinity ecosystem already is slow down, temporarily peaked at growth rate.