I don't have Hulu or Netflix or anything else, I only have Amazon Prime and youtube so that's what I'm interested in
I've come to be a fan of Scott Adkins movies. in case you don't know the action actor, he is in several B movies where he is the star as well as some supporting roles in movies like Expendables, Fast X, and John Wick 4 to name a few
some of his movies I've found on Prime and youtube that are worth watching are: Boyka: Undisputed series (also has Michael Jae White in the second in the series who I like to watch too), Accident Man, Ninja and Ninja 2: Shadow of a Tear, Avengement, Close Range, Debt Collector, Savage Dog

what are some good Amazon Prime and youtube movies that you have watched? 

I'll have to check my viewing history to be sure what services i watched which movies on.  I signed up for the free 7-day trial of Showtime through Amazon to watch John Wick: Chapter 4.  I canceled the next day, but was still able to watch other movies until the 7 days had passed.

Don't forget to check out the "Free with ads" services like Tubi, Pluto and FreeVee.  I find a ton of good movies and TV shows there that the top streaming services don't offer.

There are many Prime stuff to watch.  It's hard to narrow it down, even with your interest you posted.  This is kind of the fun part is "channel surfing" on Amazon and YT.

But YT can be a rabbit hole as not only movies you can watch, but stuff from YTers that interest you.  Like I've been watching many new things that I would have never experienced.  Like:

Van living
Urban Exploration (URBEX)
Isolated towns
What shopping is like in Alaska (or remote areas)
Yukult (The coldest place in the world where people live)
Japan food

All short clips from 10 mins to 30 mins.

Since you mentioned YT, do you have any subjects that would interest you as well?  How I came about some of these is just random vids that popped up due to their algorthym.

The Boys is pretty good. Over the top gory though
The animated series Invincible is pretty good too.

Not sure what other action movies I can think of from Amazon though.
I do like the Top Gear show though, very funny

Since you mentioned YT, do you have any subjects that would interest you as well?  How I came about some of these is just random vids that popped up due to their algorthym.

action movie, martial arts, kung fu, or I'll search the actors name

this is a pretty good one. plot is simple just mindless fighting, action, prison with dirty warden, etc.

IMO, the best classic kung fu movie. 36th Chamber of Shaolin. can watch on Amazon Prime
you think American Ninja is difficult. they would never survive the 36 chambers of Shaolin. 

this has a few MMA guys in it

action movie, martial arts, kung fu, or I'll search the actors name

WHen you run out of movies to watch, YT often has behind the scenes stuff about the movie or interviews witth the cast.  Like on the Abyss, James Cameron almost drowned. He then immediately fired the water safety person for not catching it.

fu sheng!

IMO, the best classic kung fu movie. 36th Chamber of Shaolin. can watch on Amazon Prime
you think American Ninja is difficult. they would never survive the 36 chambers of Shaolin. 

IMO, the best classic kung fu movie. 36th Chamber of Shaolin. can watch on Amazon Prime
you think American Ninja is difficult. they would never survive the 36 chambers of Shaolin. 

Heroes from the east, best of both worlds.

https://youtube.com/watch?v=R_Exl1eek3k

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Bone vs Bob Sapp

Bone vs Kimbo

IMO, the best classic kung fu movie. 36th Chamber of Shaolin. can watch on Amazon Prime
you think American Ninja is difficult. they would never survive the 36 chambers of Shaolin. 

I agree.

this is a classic
Big Trouble in Little China