I'm sending tons of hugs your way, Christina.

I've had a few huge things come up through the years, and even though I wasn't as productive as usual, my writing and the kidlit community helped get me through some incredibly tough times.
I found it tougher to focus on some of my middle grade novels during difficult times...but I could always plunge into picture books! Sometimes it helped to pour my emotions into them. Other times, it helped to write things so quirky and funny, I couldn't stop laughing when I read them out loud. Do what feels right for you.
Great critique groups are priceless! I love being in a local one, so we attend conferences together and can meet in person, which is wonderful. And I get a lot out of being in online groups, too. Like others said, check with your local SCBWI. And we have a great online critique area plus an area where you can form critique groups.
I'm a huge fan of motivational challenges...and you're just in time for one of my favorites!
If you're looking for motivation to come up with at least 30 picture book ideas in January month, check out Storystorm with Tara Lazar. It's incredible! There's daily blog posts from authors and illustrators and a supportive, wonderful Facebook group. Plus, it helps me come up with ideas for an entire year of writing at least 12 new picture books--and you can win prizes, too:
https://taralazar.com/2022/12/23/storystorm-2023-registration/ *If you're excited to check it out before 2023 starts, you can browse past posts. Anything from Tammi Sauer is pure gold:
https://taralazar.com/?s=tammi+sauerI've been a part of 12x12PB and love it--registration opens in January:
https://www.12x12challenge.com/. the goal is to write and/or revise 12 picture books each year, and there's a supportive community on a forum and Facebook, helpful webinars, an online critique section plus they put together critique groups. The first year, you have to be Silver...but after that you can try to become Gold which gives a submission opportunity to one out of two agents most months--with tons of helpful info about both of them.
And if you'd like motivation to write a new picture book at the same time as others each month, I run the PBParty New Draft Challenge and Critique Train. The next one is January 19 - 21. You write a new picture book during the challenge, then hop on the Critique Train Google doc to receive a critique from the person above you and give one to the person below you.
https://mindyalyseweiss.com/pbparty-new-draft-challenge-critique-train-faq/Debbie gave you fantastic ways to research agents.

If your novels aren't complete, having at least 3 complete and polished picture books before querying agents will help boost your chances (3 - 5 is perfect--if they love one, they often ask for 2 - 5 more to make sure you're a great fit).
If you're on Twitter, there's a lot going on for kidlit. One thing I started soon after Covid was PBParty Celebration Sunday (sometimes, I felt like I didn't achieve anything, but when I thought about it and wrote down everything...I saw I had reason to happy dance)! I also post Motivation Monday and try not to be too hard on myself...but it's tough because I always have a HUGE must-do list. I've learned to celebrate what I do achieve and not sulk about what I had wanted to achieve. I can always add it to a future list...or two. Here's a link to my latest Celebration Sunday tweet:
https://twitter.com/MindyAlyseWeiss/status/1607013307684118529