Don't know much about Tri. I do know how to compete.
If you aren't already, join the Vegas Tri Club. Make friends, get pointers from others who have done what you are wishing to do.
Bike - the aero equipment will be important, eventually.
But 1st learn how to get the most out of you and the bike. Ride with others who will push you harder, not just alone. Learn your gearing and what works for you under conditions.
Only gear I would recommend is getting shoes and pedals which work for tri-bike - running shoes are not those. You need to get your position to what works for you, then modify as you improve aspects. Dont; know what shoes and pedals work best for Tri - the club members would.
You say you have power, so if that's not the main limitation then there are other aspects which hold you back - define those and work on them.
TT is an inner thing. 20 is not a boundary, it might/can be the next step.
Ride On
Yuri
The shirt you wore is fine, if not getting logged with sweat, lose the saddle bag for competition - what is the belt around the waist for? why? get Tri club help on a good position for you at this time, once you have shoes and pedals. Ride a bunch, know your gears and how you perform with them. Fuel the motor well. Be less 427 Chevy and more 12 cylinder Ferrari - power wasted is the same as not having it.