Check out DH Labs 2.0B Silver HDMI cables which are 70% off today (Cyber Monday). I picked up 2 of them for my system, going for the 1.5 meter lengths since the price was so good. No need for 2.1 for stuff like 8K and eARC.
Also, read up on their Why Choose Us? page to get a better understanding of who they are and what they do.
All the best,
Nonoise