Agree. Salah has a big role, Liverpool will decrease their attacking power significantly if Salah is leaving Liverpool. We must remember Liverpool performance is decreasing a lot when Mane left the club. I can't imagine if Salah leaves Liverpool, too. I doubt if Klopp can get a proper player to replace Salah's position. Klopp even failed to get a proper replacement of Mane.
It is true that Salah has a huge role in Liverpool; yet Salah is an old winger and would be replaced soon by Liverpool anyways
The best opportunity would be to let go while making good amounts of money fit to get a quality replacement in the mold of Mohammed Salah.
It won't be easy to find a player who has the same quality, that is definitely something Liverpool considered before releasing M Salah to another club. In my opinion they have to do it from now on, they have to look for a replacement who can later be an ideal replacement for M Salah. Because it is not uncommon for a new club to look for a replacement player when the player has left the club, in the end they have difficulty finding a replacement.
For example, as happened with Real Madrid, when they released Benzema, until now they still haven't found a player who can replace his position well. They brought in Joselu, but he couldn't really become a worthy player to fill that void. Luckily they have productive players like Jude Bellingham so that when they have difficulties he is there to be a differentiator on the field.