Messi is an amazing player and he proved it in Argentina and Barcelona but recently he cannot have a good performance in PSG and that's all because of not having to focus and not having a good atmosphere in the team, I think Messi will have a much better performance after the returns to Barcelona where the fans love him and he will have the respect he couldn't have in PSG.
The effect of poor performance is that there are two influences that might be the cause, the first is from a team that might be difficult to work with, so it still takes a lot of time for Messi to adapt to some of his important colleagues at PSG, the second may be the influence of Messi's age, which is old enough to influence Messi's performance. At least Messi has tried hard to fully contribute to PSG and wants to bring victory to PSG.
Actually, with his current age, the performance given to PSG is very good, I think anything about the decline in quality can actually be normal, especially since there are several conditions such as age and different roles when he was at Barcelona and PSG.
While he was at PSG, he always did his best but his role was not for the targetman but more for supporting several other players like Neymar and Mbappe and of course that is still very good especially for the current season he is still the provider of the most assists.