It was difficult to accept that this was Xavi’s last match in Barcelona, but if you look at how he comments on his dismissal, it seems to me that he even talks about it with relief, as if in the end he got what he wanted. Since Xavi was fired unexpectedly, there are no rumors yet where he can continue his career, but I think that he will quickly find a new club where he will be the head coach, he has achieved good results in La Liga, so there will be many teams, that willing to work with him.
I remember that Javi said (even when he was about to quit) that he needed a break of a year in order to rest and recover. Plans may change, but probably for this he must receive some interesting offer. With all due respect, he has not yet outgrown the status of a “beginner” coach, so it is unlikely that he will receive it, he needs to choose some ordinary club to prove himself or wait for the mood to change in Barcelona and return there.