As for new signings,i'd go with:
LB: Alex Telles is the best LB not playing for a top club in Europe right now. He's an insanely good crosser and produces a lot in the final third. His characteristics would complement well Shaw, whose game i think is more defensive. Porto is a selling club, so it would be a matter of how much, really.
CB: Skriniar would be the dream. I don't think i need to say anything about Varane. But both of them would probably set the record for the most expensive defensive player. So, Koulibaly or Umtiti would be our best options (Barcelona will probably sell Umtiti if they sign De Ligt).
RB: If not Wan-Bissaka, then who? I don't know. Would Trippier be viable? Meunier is not vital to PSG, but i don't hate him that highly.
CM: Rúben Neves/Ndombélé.
RW: We need a dribbler. Not one who can dribble if needed, but one whose primary instinct is to get past the defender. Jadon Sancho will win the Ballon D'or someday and needs to be a long term target. David Neres/Frederico Chiesa are two young agressive wingers. I'd say Douglas Costa, i think his skills would be great in PL, bu he's too injury prone.
Griezmann or Dybala are in a different level, and if a oportunity to sign them should come, we must buy any of them.