I can help out with this. Omufish didn't post his recent commissioned works on his Twitter. Instead they were posted by his commissioners so you can still find most of it by searching twitter for "omu_fish" which I already did an scraped months ago. Some of the commissioners didn't name omufish in their tweets but I have a decent amount of those saved. Some of the twitter accounts that posted their commissions have since either deleted their accounts or made them private for some of the pics I saved. Also some were only posted on /aco/ and probably a few on Discord which I don't use.
I'll check my twitter scrape of omufish's to see if there was anything new posted. He left it inactive for months before deleting it so it should be the most recent scrape before deleting his account. I'll also assume that the pixiv account that had all his old art was also deleted too if you want those. I'd bet on him coming back some day again and dumping all of his commissioned art again since it looked like he came back just to make money off commissioning art.
I'll most likely just zip everything I have and post a catbox link. These were from omufish's twitter so far.