If you do the Tririg bars you're going to probably need to get electronic shifting as well to maximize the benefits. Might as well throw on the front tririg brake.
That would be a pretty potent upgrade.
If you wanted bars that were a little more mechanical shifting friendly and as fast as the TriRigs (ask me how I know!), you could go w/the Profile Aeria bars
That would be the first thing I upgrade especially since it's an upgrade that you'll ride every ride where as race wheels get broken out of the closet 6-14x / per year.
Having owned both bars the tririgs are a whole lot easier to adjust & travel with. A whole, whole lot.
Then I'd worry about race wheels. If I did buy race wheels I'd buy the deepest front I felt like I could handle for the majority of my racing. I find my Hed jet 90 to be fine 95% of the time, ymmv. The deeper you go up front the more likely I'd be to run a disc in the back to make the handling easier & the bike more stable.
I think with tires/tubes/race chain are things that you can invest in here & there as you get closer to race time. A chain you only use for racing is probably good for 3-4 seasons. Break it out, install it, race it, take it off, clean it then store it for the next race.
If I didn't have a Giro Aerohead helmet or a Poc Cerebel I'd also invest in one of those two helmets.
All the above is going to get you close to fully optimized for racing. For training a power meter is a pretty helpful tool assuming you know how to interpret & utilize the data to help your training or are willing to pay someone to do that for you.
hope that helps you think about things
Brian Stover USAT LII
Accelerate3 Coaching Insta