How to level RF build Jugg?

Im playing rf jugg right now and my damage is soooooo low im already using leveling uniques yet i cant one shot anything any advice please?thanks

Are you only doing Rf nothing else?
You can use scorching ray to help dps linked with 2-3 support gems to help it. That should clear tanky rares and unique bosses till you get proper RF investment

I played RF in every league since like 2 years and this is the first league im playing something else (cobra lash).

My experience is, that starting at around lvl 40 with RF (as only dmg skill) will give you a very fast and smooth progression through the acts and up to red maps.

One of the most important factors early is EE. If you don't use it probably (e.g. by having added fire dmg on gear) your dmg will go to nearly zero.

Maybe if you set your profile to public, we could have a look on your current character to give you some adiveces.

You better level up rf setup in swap items and think about rf as spell with requirement of lvl50-60. You can use Agony for leveling if can get dexterity and still do you rf path. Or go for 2h cyclone then respect few point back for rf.

For SSF the advice of canilaz_ is okay. But if you can get your hands on certain level items (as this is not day 1 of league anymore -> cheap), you can play RF your way up from lvl 40, which is not weak but in fact very strong and fast (since the rework of shield charge very smooth with low attacks speed as weel).

I think i did act 1 - act 10 at beginning of last league in under 10h playtime and i am not a racer, didn't skip anything and did all legion encounters on my way.

I think we can't help properly without a public profile.