I am Fran, Italian citizen with Settled Status, and I am about to apply for the British Citizenship: hooray!
I have two questions for which I couldn't see any answer in this forum... apologises if I missed them

Could you please have a look below and let me know what you think?
1) How many time can you apply for the Citizenship? For example, if my application is not accepted, can I wait some years and then re-apply when some circumstances are changed?
2) I had an unpaid au-pair arrangement for the first six months I arrived in UK. I am not in contact with the person who hosted me that time and this individual has already denied to provide any form of reference in the past (I am still puzzled by this). I don't even know where this person lives at the moment, nor I have a telephone number. So I am a bit confused on what to do: is au-pair considered a job? Should it go in the job declaration section?
Thank you very much for you help, I deeply appreciate it.
Fran