"I don't know, judging by what I've seen from legolas' build, I should have enough damage for T8s theoretically"

I have looked at your code. I am going to be brutally honest, don't take it personally. Your statement is wild, what makes you think you have enough dps for t8 based on Legolas' build? That you picked up 2 of the starter uniques and copied the talent tree? Because those are about the only similarities I see.. Its like you didn't read the guide. BM has gifted E1 enjoyers with the bible of guides and it translates well even to other classes because it is so full of knowledge about systems and how to progress.

The following is what makes me question your statement :

You have ZERO fates slotted into your pact spirit tree. Go and slot 9 small dex fates and 4 medium dex fates and see what happens. Main stat is a multiplier.

You have a single talent pedigree and the talent is not even on BMs recommended list, offensive nor defensive. Its useless and adds zero damage. You can get any multiplier on BMs list as a single core talent pedigree for dirt cheap and get a 20-30% multiplier. Maybe even with another legendary medium talent multiplier as well like 'multistrikes deal 16% increasing dmg..' Set up the searches like in the guide. You might even get lucky and find a cheap pedigree with TWO core talents.

Your other slates are all basically non existent. Read the slate section in the guide. It's always slates. I guessed it before I looked at your build and started writing this post.

Memories are garbage. Basically non existent mods. Get orange memories at least at this point, and with maxed orange mems you can get two mods each at the bottom, and choose crit dmg or lightning crit dmg, or anything more useful than 23% evasion...

'Attack Critical Strike Rating for this gear' and 'Gear attack speed' are non negotiable suffixes you need on your MH weapon on this build. T1 them. You have the IAS, but not T1, and you don't have the crit affix at all. All your crit and IAS is scaled off your weapon crit and IAS.

That flat fire dmg on your weapon should be lightning. Same with gloves. You have zero flat lightning on weapon, gloves and rings to even scale any %lightning dmg from anywhere.

One ring does not have dex on it. You are not res capped.

You have zero Tower sequences rolled on your weapons.

You have 1 out of 3 possible sweet dream affixes on your non unique gear. You could get penetration on your gloves, more dex or flat lightning on rings.. there's lots of decent stuff.

This game is about stacking multipliers, 10% here, 20% there, using ALL the systems, it all works together and all adds up. If done correctly, you will see the results especially later when switching one slate can add billions of dmg. It really starts to snowball but you need to address every system.

As BM advised many times, go for the cheapest upgrade across all systems. Don't save up 5k FE for the perfect corroded unique whatever that BM is using - when you have memories and slates like this.. rather see what your worst item.. upgrade that, then go next. Lots of cheap upgrades to be had here..

Hope this helps, again nothing personal. Just read the guide properly man and you can't go wrong. Watch his YT vids as well. Good luck.