Although it's bad for Arsenal to lose the title after many hope and impression they made in this season, Arsenal can use this season and what they harvested from it to move forwards and become stronger. At least what they have achieved from this season, gives them enough belief and confidence that they are strong and competitive enough to compete with Manchester City.
They can improve themselves to become stronger, more stable in their performances to compete better against Manchester City. In a next season, maybe Haaland will have more troubles when clubs in Premier League and their defenders will be more familiar with Haaland style and will constrain Haaland better.
What Arsenal have got this season is not that bad. Even though they failed to get a trophy, they have proven that they are a team that deserves to be reckoned with. But they shouldn't be complacent either, and they must really make thorough preparations for the next season. Maintaining good performance is not an easy matter, and for that, they must prepare a precise strategy or at least not make the negligence that has been done by Liverpool this season (Liverpool were runners-up the previous season but they couldn't do much this season).