Thanks for the list. Some of those are Kontakt and are not impacted by this.
Accordions 2 was ported - if you upgrade your Accordions to Accordions 2, you will get the Engine Player version. Accordions 1 however was a Kontakt library to my knowledge and not an Engine 2 library unless I’m mistaken in that, so if this is the Kontakt version then you shouldn’t need to do anything with this right away since it will mostly depend on the Kontakt version you have.
The Chris Hein stuff should not be Engine, I believe that’s all Kontakt.
Cinematique Instruments Library is Kontakt
Engine Artists Library is a free “demo” library of a bunch of other libraries, they haven’t ported that yet, but since it is a demo ideally you shouldn’t be having to rely on it for music-making.
Epic World has been ported to Engine Player, so Epic World should be working in the new Engine Player for you.
Ethno World 5 (EW5) is Kontakt and so that is unaffected, simply having a compatible Kontakt version should do the trick.
Forest Kingdom 3 has been ported to Engine Player, not the earlier versions. It looks like you have the original Forest Kingdom. You’ll have to upgrade to Forest Kingdom 3 to get this in Engine Player.
Gu Zheng has been ported to Engine Player, so that should be working for you already.
Poetic Guitar 2 I am unfamiliar with completely. I’m not sure if it was for Engine 2 or not. Unfortunately it looks like it was discontinued years ago, which explains why I am unfamiliar with it. If it was for Engine 2 it probably means it won’t be ported.
TITAN - this has not been ported yet and I’m not sure if it will be, simply because it relies a lot on features of Engine 2 that Engine Player might not have.
World Percussion Library - this is the Evolution Series which moved to Kontakt years ago. I would suggest contacting Evolution Series (https://www.evolutionseries.com/) to find out of there is some kind of crossgrade or upgrade discount for the Kontakt version as an owner of the old Engine 2 version.
Usually I would suggest organizing by sampler instead of putting all the Best Service stuff together - it can get confusing if you are mixing Kontakt and Engine 2 and Engine Player libraries all in the same folder.