You try hard to get noticed, You have done your best. Neither your manager nor your office staff respects you nor your skills. What should you do?

Leave.

Continue delivering high quality work till your last day - it's good for your self respect and also the right thing to do.

Either to go on doing the job an waiting for the time to be recognized, or as my colleague  Duncan Robertson said.... leave keeing self respect.

after all you are still doing your Job , sooner or later your work will be noticed everything happens happends for a reason , just keep doing good word mantain high vibes , and your work will payoff later