You might want to retry Huey Lewis. I sent to him back in February 2019 and got a response back in just over two months.

~antic

Waited over 10 yrs for Nancy Sit , still no reply

Mine from Brandon Routh took over a year - so you are still in the running. Never give up hope.

My longest wait was 6 years.

Holly Marie doesn't sign TTM. I tried her in 2012 and 2016 never got anything back

Try Maggie Q in Toronto, Canada VV at the "Designated Survivor" studio.
I had a great success earlier this year.

And don't give on hope of some of those in your list especially the 2018
I've had some great surprises come to the mailbox - my record is 86 months waiting on a success
You never know when a celeb might check their fanmail

THESE ARE CELEBRITIES I HAVE SENT LETTERS/PHOTOS TO WITH NO RESPONSE BACK -

LAUREN COHEN (18/06/2014)
HOLLY MARIE COMBS (18/06/2014)
AJ COOK (18/06/2014)
MAGGIE Q (16/05/2015)
GINA TORRES (5/10/2015)
BILLY GARDEL (16/05/2015)
KATY MIXON (16/05/2015)
GARY SINISE (17/05/2018)
KIRSTEN VANGSNESS (17/05/2018)
CHRISSY METZ (05/05/2018)
JOSHUA JACKSON (05/05/2018)
BETTY WHITE (04/05/2018)
JENNIFER GARNER (2016/2017/2018)
JULIA ROBERTS (24/06/2018)
COURTNEY COX (24/6/2018)
BRANDON ROUTH (24/06/2018)
KURTWOOD SMITH (08/07/2018)
KIRK CAMERON (20/10/2018)
KARA KILMER (20/10/2018)
TAYLOR KINNEY (20/10/2018)
JESSE SPENCER (20/10/2019)
HUEY LEWIS (20/10/2018)