hdmi cable that actually works?

[WCZ]

i'm watching 4k content on my benq projector with a 20m hdmi cable from the source (nvidia shield)

the first hdmi cable I bought was an "8k fiber" one which worked for 3 months then the signal would randomly drop

the second one I bought worked for 1 day

the third one i've just bought doesn't work at all (wish I had tested it before routing it in the walls)

does anyone have any suggestions for a cable which will actually work ? or do I need to buy boosters and such? or is it that the

[WCZ]

I might have to rethink this then as suggested, it's a logistical nightmare though because the cabinet is quite far away from the projector and the source also gets split to the tv + soundbar