hmmmm You should go further than your license.
with that i mean start listening to HAMs and mingling.
HAM radio is a tradecraft if you like. You need to apprentice a bit. Or bust your face reading, trying and failing.
i.e how to make an antenna cable....
Most HAMs have cheap chinese radios as seconds, thirds & fourths
There are some features on the "real" radios that only a HAM can use, and some nice features that only can be found there.
If you look at the radios as a tool, usage defines the tool.
I think you are good for now, you will be able to judge if you need to upgrade by usage only.
Regarding antennas, yes the original antenna is there just because there should be one.
You should buy another whip antenna, 30-40cm long.
Antennas in radio is like having a sports car with wornout tires. You will never be able to run fast.
But not even with that, your radio will be maximized.
i.e search the forum for what a "roll-up J-pole"antenna is. Its a BOB-able antenna that greatly extends range.
(you can think of this as homework for a latter day)
And then there are more to come with SHTF/prepping in mind.
Alternate power for your radio (extra battery, AA battery case, 12V converter) and use of your -5R in the car (magnetic antenna, 12V converter)
(note to all: Has Jack had a podcast with simple, down and dirty radio comm stuff?)
I hope i did not scare you with too many things, and i hope my tone sounded right.
In short the plan is, get your license, minggle (builds network of contacts/people), maximize the radio you already have.
then you will be able to decide if you want to go deeper into HAM or remain a knowledgable user, then invest in gear more.
hope i was of help,,,,