You are right, winning a trophy is all about luck, and Arsenal did not have the luck to win any. Arsenal were in top form from the start of the season, but when it came to winning the trophy, they lost their games. The Gunners made the same mistake season every season. I believe that if a player wants to play for an impressive club, he should join Arsenal, but if a player wants to win a trophy in his career, he should join another club because Arsenal does not have the luck of winning trophies.
In the Premier League, I always wonder if other managers are afraid of competing with Guardiola for the title. Manchester City has not faced any difficult rivals in the past four seasons, allowing them to win comfortably. Arsenal tried to stop them for the last two seasons, but they were unable to stop Guardiola from winning the league. If Arteta wants Guardiola to leave Manchester City before he can win the league, then I believe they are not ready to win the trophy they have been chasing for so long. Guardiola's contract with the club ends next season, and I believe he will do all in his power to win the Premier League title before leaving. Arsenal will have a difficult time winning the league next season.
I don't know if winning the English league trophy requires luck so far, because all this time I think that with the competitiveness of the English league then what is needed by a club to win the English league is of course consistency, a qualified squad and also a strong team mentality and so far I have never seen a luck be an important factor in winning the English league title and of course after reading your post, I feel wrong if I think that hard work will have a better impact on a team, including Arsenal, so if luck should be the determinant to be able to win the championship trophy next season, of course at this time Arsenal do not need to improve the quality of their team because indeed a gambler says luck is the most important thing compared with hard work and expertise.
Arteta, of course, is currently starting to try to bring in some new players who are considered capable of making their team quality, consistent and have a champion mentality, so that will they can be able to compete with Manchester City who have had a qualified squad and are supported by very strong finances in building a solid team every season, so that they can continue to be able to excel above other teams in the Premier League and of course at this time Manchester City has had 4 seasons of luck in winning the Premier League, I hope other teams in the Premier League will also have better luck than Manchester City next season so that they can break the dominance and luck that Manchester City currently has.