According to The Digital Bits, Shin Godzilla might be coming to 4K soon from Crunchyroll and/or Toho:
https://thedigitalbits.com/columns/m...ts/042125-1430
"Our industry sources are telling us that FUNimation and/or Toho may be quietly planning a new US 4K Ultra HD release of Hideaki Anno and Shinji Higuchi’s Shin Godzilla (2016). The film was released in 4K in Japan, but here in the States only on Blu-ray. It’s worth noting that next year is the film’s 10th anniversary."