Well according to UEFA Manager of the year awards, he's only been able to break into the top list, once in the last 5 years, which was the 02-03 campaign, which most people will agree was rightly deserved (his best campaign IMO).
He didn't break into the list last year (totally agree with this) but only 6 nominees were announced.
Interesting to note that across the years a lot of managers who made it into the list still got the sack or were pushed out and in the in the EPL we got names like De Zerbi, Solsjkaer, Tuchel, Moysie and Klopp.
Looking at past members of the list, it's likely he'd get a big club after leaving us as you suggested.
https://en.m.wikipedia.org/wiki/UEFA...the_Year_Award