Ok. I have good news 
Today I had a catch-up with the (very small volunteered) team maintaining our IFTTT integration.
We admitted that Monzo-IFTTT needs a bit of attention, as the community clearly wants it to keep going, despite how much it costs us.
We are also formalising our internal processes, time management and communication with IFTTT people to keep this running. 
Taking in consideration feasibility and data available, right now we gathered the following list of features the community wants:
- Support for join accounts (which seems to be the #1 asked for by all of you)
- “My balance goes above/below £x” trigger
- Incoming transaction (Direct Debit / Transaction / Transfer) trigger
- Applets with formulas (we still need to see how feasible this is within IFTTT itself)
Watch this space 
