I’m in a similar position with a 1.2 app
Basically Meteor is a mess, lots of libs are dead, and there is still a lot of churn going on. Seems like a nightmare for long term products built in Meteor.
I used to use Meteor a lot, but now, I’ve completely moved away and using other platforms ( which is actually working out a lot lot nicer ). But these legacy meteor apps I have are now a bit of a nightmare and still there doesn’t seem to be a good future proofing other than entirely embrace react … but if you do that, you don’t really need meteor. Also the more time I spend with Mongo, less I like it, so for the most I’ve abandoned Mongo as well.
The one thing Meteor does nice, that no one else seems to do nice is a baked in user / authentication system.
So my recommendation is to port off meteor if you can. Otherwise go react if you can, otherwise, delay the pain and muddle through with whatever is “current”