Diaz has made a big impact but Liverpool were still unable to fill Mane's place. After the Gakpo transfer they can fix their problems in productivity in time hopefully.
Diaz is a good player and he adapted so well in Liverpool but his contribution is affected by his injury. Furthermore he is not at a similar level of Mane but Liverpool must rebuild their trio with Diaz and other new players. Mane is no longer in Liverpool, Firmino will leave the club soon and Diaz together with Gakpo, Jota, Nunez, and Salah will be their future.
Until now Luiz Diaz has not recovered from injury so Liverpool cannot rely on it too quickly even though he will recover later of course the performance will not be 100% as good as before so it needs adaptation again I don't know how it will be if Diaz is able to maintain a good contribution to Liverpool after he recovers or will decline, but what is clear is that Klopp has made all of these efforts by bringing in several Gakpo and Nunez players, maybe this will be the target of their trio in the future and the process is underway to bring them back together to become solid again.
Tottenham doesn't seem to be playing well lately, in the last 5 matches they have collected 2 victories and 3 defeats, antonio Conte will have to do better if he wants to aspire to more ambitious places in the standings. moreover, they must also be careful of Brighton who are at -5 points but have to play 2 more games, and could overtake them
Early next month Tottenham will play against Manchester City, of course this is another tough test for Conte to face a difficult situation, I'm not even sure that Tottenham as the host will dominate their game because of the fact that Manchester City is more superior from now until the previous match, if Spurs were able to avenge yesterday's defeat, so Conte has made quite good changes in evaluating his strategy, but I still have a feeling this will be better for Manchester City's game.