Ok first the Iss has BR and PoF while in Rim, you dont. BR gives iss a patk increase.
Issue with archers is they need damage elevators to be better. First thing at a bare min u need is at least r110 enchanted bow of at least +8 or higher i think i saw a few +12 ones for under 35 billion adena then u just need to at least enchant it and build it up from there. Not knowing your level you need to work on dual class get it to at least 107 dual skills increase your damage a lot on your main class (that just costs time no money) (I went 3 levels of patk 1 physical damage ~increase patk lower pdef, death +5% damage skills and attack attribute)
Also not knowing how you build your AP that might need to be reset Mine was all in warrior till 110, Line 1 4 might 4 element Line 2 3 craft focus line 3 craft death 2 mortal line 4 4 level of battle 2 fire 1 reduction level 5 2 binding attack and 2 divine attack and level 6 +10% damage
When xping you need use the right self buffs also I use dead eye stance (which turns into final stance at 110) and hawk eye to make out my burst / one hit damage is where the archer lives. Ideally you want to build towards 1 hitting anything you attack. I mean this is stuff to get you started in the right direction I have had to fix many people upgrading wrong so you have to start with the foundations first. Everyone has slightly different builds but archers need to build for max skill damage/crit and lowest cooldowns as possible.