I'm very sorry about your loss.
The whole process of disposing of a loved one's belongings after death is upsetting enough without having selling limit issues.
Because you haven't sold for some time, eBay will have now classed you as a new seller, and they imposed those limits as risk mitigation for them.
Emailing eBay will be useless. Don't even bother with it.
The best thing you can do is to use Live Chat.
To get to eBay chat, go to the bottom of the Help page (https://www.ebay.com.au/help/home😞
We're available from 8am to 8pm AET
Monday to Friday, and 9am to 7pm AET
Saturday and Sunday
