Dembele was contracted for 5 years and this seems very convincing that PSG really believes that Dembele can help PSG to win a title this season at the top of the standings
Dembele is a good player and he will be a good replacement for Neymar who left PSG and moved to Saudi Arabia. Dembele has better speed than Neymar and he is younger than the Brazilian player too. With Dembele, PSG will have better ability to do counter attacking with his speed and less dribbling habit than Neymar. Five year contract looks good as after the contract ends, Dembele will no longer be young and PSG will consider to replace him by another younger player.
regarding Gancalo Ramos it looks like Enrique will provide a new strategy using Mbappe and Ramos for attacking line positions because it takes advantage of performance Ramos seems to be very good to work with Mbappe but these two players seem to have a strong chemistry first but the situation is a little difficult and lets see in the upcoming matches maybe my prediction was a little wrong.
Ramos just had one good match in World Cup 2022 and I am so doubtful that he will be able to be a good striker for PSG. At least he is ready to learn and improve but at his age, I think the chance to see his big upgrade is so slim. I am unsure that Ramos will be combined well with Dembele and Mbappe as if these players play together, Ramos will have to sacrifice central space for Mbappe as the French player will be unhappy if his opportunities to score goals drop because of Ramos's appearance at the center.