Yash, I agree with Microburst2002.
Don't leave FL unnecessarily.
Try and relay your 'Negative RVSM' status.
Fly accurately.
When ATC is in picture, they will establish separation based on the situation (minimum 2000ft separation). They are at liberty to change your FL to achieve this.
Descend out of FL.... only when you cannot maintain FL e.g. engine failure, pressurisation failure etc.
Importantly, AIP on the subject is a- must read.