Can I apply for another COVID extension for my visa in Thailand before March 30th?

Hi, I've had a 'visiting Thai family' extension, and i'm now on a covid extension issued at Chiang Mai immigration which expires April 28th. However, i've no work in the UK until the end of May at the earliest. Therefore, i would like if possible, to stay until that time? I'm hoping it's possible for me to apply for a further covid extension before March 30th? (Which i believe to be the final date of application.) If this solution to my problem is not possible, do you have another idea. Many thanks.