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He is 37 now. His statistics have been on the decline in the recent years which is natural. Even his last team Sacramento Kings doesn't want him anymore I guess...
In the previous years a Euroleague team got interested in him again but he didn't want to leave the USA. Do you think he'd consider it seriously now?

When a NBA player doesn't have any offer, they usually accept offers overseas and with the caliber of Westbrook, I still believe that despite his age and declining stats, he can still average like 10-15 PPG or even 20 PPG if he plays overseas.
I mean you also said that there are still many teams who wants him to play for them, and if I'm Westbrook's agent, I might just try and have a peak at those offers especially if you already know that there's no team that has interest on getting your client. I also saw that there's no other team in the league right now that doesn't want him, and probably that's because of the declining stats, and maybe other teams will just prefer a younger role player than a 37-year old player like him.
There is a news that holiday will be buy out by the blazers, if that happens the sixers will try to pursue him and that makes the sixers a powerhouse in defense and offense, they are already upgraded when lebron came now they will try to add another player.
I cant seem to find the news, would you mind putting a link we can verify?
News and rumors are different, probably its just a rumor, but its still nice if you will also put some source or reference.
This is the most legit article that I can see online. It's from Sports Illustrated itself.
https://www.si.com/nba/trailblazers/onsi/should-portland-trail-blazers-trade-jrue-holiday-before-opening-nightThose are just rumors, and I don't also think that the Blazers will trade their legit defender for draft picks. He's also a good leader to any team that he goes, and right now he's maybe mentoring Avdija to become a better player so I don't see any reason why the Blazers will trade him. Of course if there will be a trade where the Blazers will not say "NO" to it then that might be possible, but right now, those are just hearsays and predictions coming from different NBA Fans.