I also got this interest in recent months …
You can definitely get faster even on road bike - 23.5-24 mph should be doable on flat no wind course at that power. I say that from my experience on a 7 year old non aero road bike with redshift bars, two bottles, frame pump, top bag, varia… (i.e. not a stripped bike) and a not extreme position testing on flat rail trail in the 240 range.
If your road jersey is not super tight, finding one that is may be cheaper and more versatile than skin suit. This was a big gain for me. I also seem to be a little faster with smooth arm warmers but haven’t tested that explicitly. It may be an ok poor man’s approach when starting out.
Totally agree with other advice above as well!