"Don't fix what ain't broke".
Bike parts are a lot more expensive piecemeal than when bought on a bike. Thorough upgrades is usually a poor way of managing your money.
A better option is to get a jar.
Write "new bike" on it.
And everytime you get the urge to replace fully functional parts, stuff money into the jar until the urge passes.
("bike trip" or "big tool set" are acceptable substitutes for "new bike")
Fit items are OK to replace. No point in avoidable suffering. And it's not like you can wear out a stem or a bar anytime soon.
I consider keeping two wheelsets OK - as long as you have reasonably dissimilar tires on them.
Personal recommendations are a so-so thing. At that price, it's a decent enough bike. Nothing that actually needs replacing. A change I'd prefer might not do anything for you. Ride it until you discover what - if anything - that isn't quite working for you.