A MUCH stronger start!

At least until you get to the point made by vranasm:
the rax at this point of time was waste
To put it another way, building the barracks makes no sense here unless the plan is to rush Monty. Otherwise, you’d have been far better off building units for fog busting and to replace your early explorers.
That said, with an annoyed Monty nearby, I think you’ve really only one choice: prepare for war. The key question IMHO is therefore what weapon to use. As vranasm notes, writing to speed up HBR would be fine here...and would allow you the opportunity to settle the jumbos in the interim for some early extra happy. Another option is jumbos / catas...and if you go writing via AH you can leverage philo to get an extra fast GS to bulb maths en route to construction for the catas. If going the latter route, there is a possibility of being rushed early by Monty – but you’re protective – and so not only get great archers (thanks to the totem pole too) but also cheap walls. I’m not sure it’s really necessary to find a hillside target as a result.
If you’re comfortable using the whip and stacking whip weariness meanwhile, you could also consider using both your cities at this point to whip an army of chariots together ASAP. (This means you need to revolt into slavery – and then allow city #2 to grow to pop 3 onto the improved rice...at that point it builds the last worker you need and then builds / whips chariots just like the capital.) If going this way, bear in mind you need your workers to (i) chop a couple of forests to accelerate production (ii) camp and road to the ivory when your capital's borders pop and (iii) road to Monty – so your worker micro will need to be decent too. The other things re: tech to note if going this way are that (i) you’ll need hunting rather than mysticism next – to access the jumbos and raise your happy cap and (ii) post hunting, I’d likely start teching pottery or writing (likely the latter, you being philo) because increasing army maintenance will cause your slider to fall...and use the proceeds from taking Monty’s city / cities to finish teching.
FWIW, whipping chariots would be my preferred option here (because I’m comfortable stacking whip weariness to happy cap and working mines otherwise) – but I think any of the approaches outlined above will work. If you do go this way though, bear in mind too that Monty may well have a second city when you rush – you may get lucky and find he has just his capital, but I wouldn’t count on it. As a result, you’d be advised to (i) scout out Monty for signs of city #2 and (ii) likely be willing to produce around a dozen or so chariots to take down two cities. Remember, he’s aggressive...so you’ll likely be facing promoted defenders, because he’ll likely build his cheap barracks.
Look forward to seeing what you do.
EDIT: One other thing re: a battle plan. If you do go chariots and find that Monty does have two cities, the best way to proceed IMHO would be to attack him simultaneously in both cities using two stacks. Stack one - your large and more experienced stack of promoted chariots - would head straight for the capital. Your second smaller stack, consisting largely of the unpromoted chariots whipped out of city #2 would head for Monty's second city. In short, I would advise against keeping your chariots together in one large stack - because that will only give Monty more time to whip defenders.