Post long experience with IRCC, nothing much in your hand to do other than waiting once nothing still required from your end . All calls, emails & follow - ups, reach out to your MP, etc... are just more stress for us. Leave it for the time until they finish & close it.Some of Ottawa applications were transferred to Niagara Falls for oath I believe. You can call the helpline and once you find out you he office can get the office's email address here and email saying you application is very old and hasn't gotten oath yet.
Typically the resonse rate seems to be better in general for older, backlogged applications.