I think the problem of the Brazilian national team over the past one year is majorly caused by the poor tactical approaches of the coach of the team. Brazil unarguably possesses the best football talents across the globe and it's actually very embarrassing and disrespectful to the national team for anyone to use the injury of just one player as the excuse of their poor run.
Yesterday in the Spanish Super Cup final that'll was played in Saudi Arabia, four goals were scored by Real Madrid and all four were scored by two Brazilians Vinicius Jr and Rodrygo. So it's safe to say that Brazil national team is capable of winning every match they play without Neymar and his absence shouldn't be an excuse for their poor current run. There are so many experienced managers that'll gladly take up the job to coach the Brazilian national team so the country's football governing body CBF should as a matter of urgent sack the current manager and hire a better one that'll bring them back to winning ways.
I would say "best" is a bit of a stretch, they are historically a great football nation there is no doubt about that, but I would give France the credit for having the best team if you ask me, feels like they are doing as well as people hoped they would do as well, one world cup and one world cups final with a last minute save, they could had two in a row if they got that shot.
All in all I am guessing that we are talking about Brazil, of course they are better than what they have done so far and I think it should be important to consider this as something that would benefit. I am not saying it is going to be easy, but it is not going to be all that easy, we need to figure out something else. Brazil with a new manager should do better hopefully, if not, that's a big issue.