617th honestly it sounds like you shouldn't be taking as many commissions as you are. I understand needing money but if you're unable to do the work/work slow you should limit yourself. Don't give yourself a queue of 30 people. limit yourself to like 5 and only accept new clients when these 5 are done. If people ask for coms while your queue is full, add them to a ping list for when your reopen commissions.
a public post about update on everyone is not 'the best of your ability, to inform others' those are easy to miss since not only people follow a lot of people and cant see everything posted/might scroll past post that don't have art but a lot of social media site now work with algorithms that aren't simple 'post in chronological order' and might hide post that they don't consider being good enough for the viewer.
You probably shouldn't have replied in such an unprofessional tone. Clients may get pissed at you (some might already be with the lack of communication) and file chargeback because of it.