hello and welcome
i also don't understand why you've been limited to tobacco flavours.
i've never used juul, and though i'm sure some more recent, larger pod systems can give strong enough flavour, i can't imagine juul being one of them.
for liquids to be your first question is interesting, do we understand you've got the vaping gear figured? there's a big world of flavours out there, cheap, expensive, ready for use with a certain level of freebase nicotine or nicotine salt, flavours you can mix yourself with the nicotine type and level of your choosing in addition to difference types of liquid bases which are chosen based on preference (flavouring density, cloud density, allergies, etc) and compatibility with devices/tanks and/or with nicotine level.
this is not meant to complicate things, just to assure you, there's a lot out there you would like (chances are even in the tobacco range, which doesn't constitute the whole or even half of the available stuff_ except for wherever flavour is banned, in which case you have to go with mixing it yourself option, which isn't that hard).
there's loads of guides and tutorials out there and here and videos on ytube for easy consumption.
you can stay within the pod-system, like juul, but more versatile. just look up a top ten somewhere. here's a bunch of recent famous stuff
there's something like a pod system call AIO (all in one) youtube it_
otherwise you might want to look into getting a MTL (mouth to lung) tank + a mod (the device, which you can hook tanks into)
for stronger flavour DL (direct lung) tank [plus mod of course] are all over the place, but they are the farthest from a cigarette and you can't put a lot of nicotine in them (though because their vapor rate is high, technically you should be receiving a similar amount in total)
_ i couldn't quit when i first started with DL. it makes sense it's often called 'more advanced' except it's not advancement in the sense of expertise as much as distance from a cig.
i had to start on a pod like you, then started using DL again in conjunction with it.
now i use MTL (mostly when i need quick relief or when i'm moving around town a lot, as it's more practical_ needing less refills, less potential leaking, requires less power-battery, relieves me quicker like a cig used to, etc) and DL most of the time, because it's tastier, and more vaping for pleasure/habit rather than needing the fix.
i recommend getting a new decent pod or a MTL tank (innokin Zlide) with a mod (Vaporesso Swag II is a decent option for a small size) [with the latter setup you can also get a DL tank now or later to put on the same mod, though there are sometimes size compatibility issues]. youtube reviews are a must. you'll be familiar with everything in no time.
keep coming back and ask about every detail at every step_ ppl are reakky helpful here