+1 on getting a fit.
Find a great fitter, start with that, then look at bikes that work. I’d seriously consider going secondhand as well. TT bikes tend to be low mileage as you’re not generally out there doing group rides, training in the rain, etc on your TT bike. And there are lots of triathletes who either upgrade every year or 2 or who don’t stay in the sport that long. Plenty of good deals on relatively new and good condition bikes to be had in other words, and there’s not been enough innovation in the last few years that’s there’s much in the way of “must have” features on new bikes. Maybe worth considering a bike with integrated hydration and storage (I assume you’re doing 70.3 or longer events from the number of bottles in the picture!). And leave enough in the budget for an aero helmet, there’s easy gains right there!