It seems that Barcelona still cannot forgive Neymar the way he left the club, and his character is also problematic.
When Barcelona’s current financial problems are added, it is clear why Neymar is being held as a reserve.
Source: https://www.marca.com/en/football/barcelona/2020/05/24/5ecaec3f46163fb1628b45d7.html
Neymar is a fantastically gifted footballer but you’re right, his attitude stinks. I don’t think he’s a good option for Barca right now, you should never look back, always look to the future.
I think his only (or the best) chance to return to Barcelona was last year, before the big financial crisis in Barcelona due to the corona crisis.
Now it is much harder, because less money is available, competition in the league is still uncertain and the difficult character of Neymar is well known.
In addition, their parting was difficult and there were legal disputes.
It's better for Barcelona to start preparing for the future and the age without Neymar, Messi or Suarez and turn to new, young football stars.