This support request is being escalated to our root admins who can look into this more for you.
Typically, requests are marked [Solved] by the volunteer staff when they have actioned what was being asked for, so we don't get a case of multiple people picking up the same request. Just because something is marked as Solved doesn't mean we won't keep trying to help you if needed. ? Making a new thread as you have done is great. Sometimes folks go back and update the [Solved] thread, which is okay too since we try to check all new messages, but it's easier for this thread here to stick out as not Solved so it's less likely to be accidentally missed.
I don't believe there should be any extra config you'd need to do once the SPF, DKIM, and DMARC have been set up, since I've seen users get a 10/10 grading on the mail-tester report right after it's all been set up. Getting a low score after that point, from the things I've seen, can be down to the user just putting 'test' in the test email or because they're using a domain that's typically associated with abuse (like .xyz or some of the less-trusted ones). But none of those things apply to you, so the root admins can doublecheck what's happening with the records they set up.