I'm by no means a titled player myself, but I could play some unrated 15/10 rapid sometime if you just want some quality experience.
If you want to play titled chess players, then the best place to do that is by watching chess streams of titled players. Many of them have times where they accept viewer challenges. Usually it is blitz and usually it is rated, but some streamers play it unrated and some streamers play longer time controls too.
Good luck playing some titled players
Will any titled players play me in a game or two of 15/10 rapid? I think it will be a great learning experience for me. Please tell me the time you will be available. (For free, please. I don't want to pay any money.) Thanks.