Newcastle still needs to improve the squad instead of letting some of its best players leave at the end of the season. Alexander Isak is one of the important players in Newcastle's squad this season, so they need to keep him instead of selling him. It is true that it is difficult for Newcastle players to hope for a title, but it is not impossible for this team to follow in the footsteps of Manchester City because of its good financial strength.
This season Newcastle's performance is very different compared to last season, even though they have improved their squad. Of course player injuries have had a significant impact on the team's performance, but that should not be the main reason why they have dropped so much so far.
Newcastle United decline in performance, their strength have reduced to minimum, they're settling for lesser results and having zero voltage to withstand the stats of elite teams. The magpies boss, Eddie Howe was the promised change for Newcastle but more ugly incident have happen. This season is entirely different for Newcastle United, they've been struggling to win matches from day one and they didn't horribly in the UEFA Champions League this season. Newcastle United is an average team despite the uprising stars they're in possession of.
From what I have noticed regarding Newcastle decline, it is because they did not make good use of the transfer market season and had too much confidence in the squad they had last season. Meanwhile, other teams that are currently at the top are making improvements so that they are at least able to maintain their performance in the EPL. Not only that, the strong reason behind Newcastle setback is the mental factor of the players, mental matters cannot be taken lightly, because speaking of the EPL you need to be mentally strong enough to be able to compete. As a result Newcastle lost its best performance, and we can't expect much from Newcastle club management other than having to go through a bad phase because of its own mistakes.