Partnered LLC --> Single Member LLC?

I created a Partnered LLC with brother in NY last year, but after having a baby, he opted out of being active in the business. I did 1/2 1099 freelance gigs, 1/2 LLC freelance gigs (but 100% of LLC work was done by and payed to me).

Now realizing how much of a nightmare 1065/partnered LLC's are, I'm seeing if there's any way to retroactively change the operating agreement/forms so I only need to file as a single member LLC?

Otherwise it seems like the cleanest option might be to file a first, and last year 1065 for 2025, then just act as a single member LLC under the same EIN going forwards?

I've been pulling my hair out for weeks over this, and because its a partnered LLC, no CPA will touch it for under a thousand dollars. Any help is extremely grateful!!