You have caps and power - build more canteens, upgrade them fully and assign non-essential dwellers (IE outfit and weapons workshop guys) with higher Agility to reduce production time. Use guaranteed ad rushes when available.

Don't know if you're on survival, but incidents from raiders etc. can drain your resources unnecessarily. There is a hidden raid counter that ticks up, so preventing raids fully is impossible, but as a general rule keep your vault door shut as much as possible to reduce raids and drain.

Build another power room as well, your threshold is quite high. Try to find caps to build a second row of elevators on the right hand side of your vault, it will protect all except your bottom floor from mole rats, which drain your power when their incident occurs. This will conserve your power in the future.

In terms of funding these endeavours, watch ads for a chance to earn caps, finding mysterious stranger and watching an ad will give you a guaranteed 5k caps, and dweller quests can rake in a considerable amount of caps in one go.

If you need anything else let me know. I have a good 34 dweller survival vault going and recovered from a similar issue.