Fiverr is freelancing, not a 9 to 5 job with benefits. If you want a “raise”, you give yourself a raise by raising your Gig prices. Simple enough.
Also, if you had answered your messages within 24 hours, you would not have an 83% response rate. You have 24 hours from the time someone sends you the first message to get back to them. Yes, everyone is busy, life is stressful due to Covid or whatever else - but, if you have a smart phone, you can get the app and see when you have been messaged, answer them, even with a, “I will get back to you tomorrow or whenever, as I am not at my computer” to avoid your response rate tanking.
Then, what is the big deal? If this is just play money for you, it doesn’t make much sense that you are so outraged by your level demotion.
The good news is, getting your message response rate back to 90% is the easiest metric to fix. You will be back to Level 2 in no time.
Just realized she took her toys and left the building. She will probably be much happier on other platforms.
Also, is her pic Jane Curtain? (old Saturday Night Live not ready for prime time player) Looks like it.