How can I further support my husband who recently lost his job?

Leverage your network together to see if anyone knows of openings in relevant fields.

Remind him of his past successes in finding new positions quickly.

How long can you sustain the family expenses on your own? I'd suggest that you take care of the finances first and foremost.

Create a safe space for your husband to talk about his feelings and concerns regarding the job loss.

This thing works the best, Stick to regular routines as much as possible to provide stability during this uncertain time.

Brainstorm the skills he's developed throughout his career that can be valuable to new opportunities.

Have faith in them, be positive and encouraging but not patronizingly so, try to do something special (doesn't have to be big), compliment the things that you see they're doing even if it's not paying off...

Communication is the key.

So my advice is to let him have a little space to breathe and enjoy a break- a week, two weeks, whatever it is you both need to gather your thoughts and decide your plan.