~snip~
EPL is a domestic league that the clubs are use to the game pattern of their opponents, and that makes it easy to understand themselves in the long run. Europa is filled with clubs from various leagues making it hard for them to understand their game patterns. This is why clubs that you don't expect do win this league. Amorim needs to understand that it's easier to achieve success in Europa than EPL.
You are absolutely right and that is what often makes it difficult for some team to win the Premier League title, those team that failed to compete for the Premier League title only have potential in several other competitions but the main one is the Europa League considering that this is one of the League that is quite important but can still provide very big opportunity to win it easily.
If we talk about Manchester United, I actually only focus on them here, there is no hope for the Premier League and they could beat several team from other domestic leagues here to compete for the title, it would clearly be very satisfying assessment if Amorim managed to bring Manchester United to win the Europa League this season.