I wanted to restate your question in W/kg terms, since the low raw watts relative to what an average ~75kg dude might put out could be deceiving: You’re currently at ~2.7 W/kg, your peak is ~2.9, and you want to get to ~3.5 in six months. You’ve been cycling for two years, and training on TR for one.
Honestly, 0.8 W/kg in six months is a tall ask. You’re young, so I’d wager you’ll get there eventually, but you’re talking about turning what is now over 125% of your threshold, into your threshold. The only times I’ve had gains like that, that quickly, were when I first started, and when I’ve come back to training after a long break for illness/injury (and when I replaced my wheel-on trainer with a direct-drive 
).
TR has some great charts that visualize average thresholds for different buckets of riders on the platform. Here’s women aged 18-30:
All that said, the advice you’re getting about going on the ride anyway is great! Power matters less than you’d think when you ride in a group, so if you can get good at saving energy, you’ll be able to hang even your watts are lower than you’d like.
(I could be completely wrong about all of this. I don’t know you, and my own experience comes from picking up cycling late after no prior athletic history and with no genetic talent. If you prove me wrong I’ll be ecstatic! 
)