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Last season the Premier League also looked more competitive in my opinion, because Manchester City was really consistent in chasing Arsenal points last season. And it is likely that next season Manchester City will still be very strong even though other teams are also making better changes so they can make it difficult for Manchester City. But if other teams follow the tactics developed by Manchester City, it will actually make the other team weaker because it will be easier for Manchester City to find the key when making their attacks.
Pep Guardiola is one of the best coaches in Europe right now and he can adapt his strategy whenever he feels the need to. Manchester City is also supported by a lot of quality players so it's not too difficult for them to win the game even if their opponents play tough in defense, but on many occasions we can see them find loopholes to win the game.
Manchester City is the favorite team for next season even though many Premier League teams are building the quality of their teams with several new players. I'm not sure many teams can stop Manchester City's dominance of the Premier League, but it is always possible because football is a team game which in reality can produce different results when they fight together to win or avoid defeat.