Converter and increase % element damage

I think i don't use Avatar of Fire but 2 rings : Pyre ( 100% cold -> fire) and Call of the Brotherhood (50% light -> cold)

and this tree


it s a particular tree because i want use Flicker strike + Oro'Sacrifice.

I focus +% element damage i have wright or not ?

In your case it would also be better to take fire bonuses, a lot of your damage ends up as fire and you're also using Oro.

Just in case you missed it, 10% elemental damage is not the same as having 10% fire, 10% lighting and 10% cold. Elemental damage actually means 'apply this bonus if the target damage is fire, lightning or cold', so you'd still get 10% even if the target segment is all three at once.

Your tree is the classic 'dodo' tree most of newcomers make at first, what it will do best is to get you well and properly dead once the difficulty starts ramping up.

It looks you are trying to convert damage because you think it makes different damage types modifiers apply multiplicatively to each other. But in fact all applicable "increased" damage modifiers stack into one multiplier. Converted damage also retains its original properties

multiplicative modifiers say "more" or "less"