Robert Lewandowski is of course one of the greatest strikers now. He is getting older but his performance improves more in time. I think that he is better than last season now for example. He can break a new goal record in the Bundesliga if he goes on like that. Bayern Munich are really lucky to have him but he seems likely to leave this summer also I think. Actually it will depend on the offers for him. If he gets a really satisfying offer from another big club, then maybe he would make a change in his life from now on.
Bayern is trying to renew Lewandowski contract and I don't think he wants to leave the club. He is doing fine there, a change will not make him better but may end his career. AFAIK PSG is interested in his services which might be interesting especially if Mbappe will leave the club and since Messi isn't top right now.
If Lewandowski is not renewing his contract with Bayern then surely something is going to happen, so we are having rumours about Haaland is also linked to Bayern is also having some truth because they are trying to have their options wide open for future if he wants to leave this club for some better future even he is currently having his best game here but still many times things like this happened and players try to bring change which can end in a good or bad both ways for them.
If he leaves Bayern then surely his next destination could be Spain because Real Madrid and Barcelona both need his services and he can go there, but where it's not sure.