It won't be easy for him to find a place in Liverpool's current squad.
If I were him, I'd move to a team where I could play regularly.
I don't think he's a top-tier player.
The German or Spanish leagues are exactly what he wants, the kind of leagues that suit his style of football.
He could easily play for teams like Dortmund, Leverkusen, Sevilla, or Betis, but I don't think he'll be able to play at a higher level.
Because this has already happened to him, he should have opened a dialogue with the management and sought clarification regarding what happened to him until he was not included in the squad list. If he wants to play regularly in every match, he must find a club that believes in him. Because the coach also sidelined him, there must be concerns and considerations made by the coach for not including him in the squad list.