First I'd like to apologize for the dirt in the pictures. A lot of this stuff has currently lived or living behind furniture and this is the first time personally looking at a lot of these sockets as I'm newly living here. They are all being cleaned when things can be moved properly and before any use. 

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Long story short I have a mini PC, switch, switch 2 and laptop. Its very rare that more then 2 of my devices are connected to the wifi, but other devices are (normally just a phone OR TV.) My laptop and both switches very rarely have issues, however my phone and PC do. I have done a lot of speed tests and when the wifi is good phone and PC often sit at around 149 (wifi package is skyfibre 150 Wi-Fi 5) and around 5 to 8 seconds of ping in the desired room. However wifi on my phone will sometimes completely shut down (switching me to data) and PC will slow down considerably. 

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Have also tested with a bufferbloat tester and it will quite consistently fluctuate between close to best to close to worst. Which is where my issue is, primarily on pc. It can randomly take minutes for YT or disconnect me from game servers etc at both peak times and off peak. 

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Im aware I won't get faster wifi, which is fine for my use case, just after more stability. I would like to know what is the best option. Internet is still needed for other people so don't want to change anything to do with that. I also don't want to set up something too complex, as my stay here is not permanent. 

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Recently purchased some Asus zenwifi xd5 hubs. Planning to run as an AP connected to router via cable and the second node in target room with PC connected via cable and other devices wirelessly to node. 

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I know Ethernet has been run through the house at some point, specifically to the room I am using, before me. However I can only find a coax port (pictured above) this is the part that sort of confuses me as I've read about moca adapters and don't know if any of those would work. The open reach port next to router (pictures above) uses a different lead to Ethernet but an Ethernet will fit, from what I've read online anyway. 

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Wired link is also an option however I haven't looked into that too much. 

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Just looking for a little advice for the most cost efficient and removable ways to make connection stable so any help appreciated, thankyou 

Some advice needed