All HDMI inputs are being used, how do I use ARC device?

[Thready]

I'm getting a Dolby Atmos soundbar and it needs the HDMI 3 that has ARC. The problem is that I use all HDMI connections for a PS4, Roku, Blu Ray player, and cable box. 

 

What do I do?

 

EDIT: I meant the TV's HDMI outputs are all used, but you guys mentioned an HDMI "switcher" which I just looked up. I can put the cable box and PS4 on it since they don't need 4k.

 

Sorry for the confusion guys. 

[shoutingsteve]

sounds like a great time to buy a switcher.
https://www.amazon.com/Splitter-Aluminum-Switcher-Bi-Directional-Support/dp/B09D7MRPJF/ref=sr_1_6?keywords=hdmi+switcher&qid=1637028926&sr=8-6

[incredeblebobs]

does the sound bar not have a hdmi input? i would pass trhough one of the device. not the ps4 it creates a bit of input lag. you can also get rid of the blue ray player and play them on your ps4 maybe?

[BuzzingBee]

Something isn't right: Dolby Atmos and ARC. Does your TV support eARC?

EDIT: nvm, it can given sound format is DD+. 

Your best bet is to get a HDMI switch or use optical cable from TV to soundbar (but won't support Atmos) 

 

[Home Theater Dummy]

You stated GETTING a soundbar that has ARC. which one is it?

I don't know of a single Dolby Atmos Soundbar that doesn't have at least 2 HDMI Inputs. (not saying they don't exist)

I would connect nearly all those devices (especially the Roku and Bluray) if possible directly to the Soundbar via HDMI letting it act as a HUB, (Kind of like an AVR/Receiver) then one HDMI cable from the Soundbar's ARC output to the TV's ARC input.