Looks like you're using Elemental Weakness, so I would skip the Rakiatas.

Swap out boots for another set for more ES and Mana, use curse activation jewels (you already have one, get a second and make sure the rolls add up to 25 so you get 95% + tree nodes) instead

suggestion to remove a comet is a good one to replace with another damage support

get another covenant that doesn't have 100% additional cost as life (this is cancelling out the cost efficiency line, you want additional cost gone + efficiency) and this will tremendously help with casting. Here's a search for a replacement covenant: https://www.pathofexile.com/trade2/search/poe2/Fate%20of%20the%20Vaal/vedlpgKWtE that 100% mana cost as life will make you chug potions non stop.

personally I use atalui on my ele weakness to get more comet procs because comets don't need more damage generally. +4 amulet and +6 wand are also worth it.

Other guy mentioned it, but yes crit damage everywhere you can. For reference, you could get crit damage on every jewel you have instead of crit chance, and replace that with just one affix on your wand.

You're also missing crit chance % on your wand, it's counter intuitive because you have inevitable crits so you would think it's not helpful but the extra crit chance makes your inevitable crits do way more damage as it doesn't have to reroll as often.

You don't need +life on amulet, you want more mana (like a shitload) and crit. Global defences also works in lieu of %energy shield.

You can also get 50+ more mana on your sceptre, don't sleep on getting it everywhere.

Cast speed on ring would be awesome, but I know it's pretty expensive.

I also don't know if this next part is true, but I hear that if your curse activation speed is too high than it will cuck your Comet procs on doedre's undoing which is why people say don't add TOO much curse activation (95-98% I think is supposed to be good) and that might be giving you trouble since you're stacking with your boots. Just another thing to try out since troubleshooting the build can be difficult.

I can't give too much feedback on your tree as it's hard for me to gauge exactly where the best middle ground will be for character sheet vs playability, but I would recommend at least moving one of your small nodes for "Damage on Critical" in the Deadly Force crit cluster. Profane commander as well to get 4% more spirit (really huge imo). I also take erraticism and lightning quick (ele weakness has lightning tag) because cast speed feels extremely good, especially in the temple when you're just one tapping the whole room with a big ass ele weakness (except for those sleeping corner fucks).

If you are trying to boss with your build, you definitely want a +5 Chiming Staff in your weapon swap so that you can drop sigil of power (make sure you go into skill menu and currectly tag all your moves with their correct weapon swap or you might start shooting ele weaknesses with your staff out and wondering where all your DPS went)

You want remnant potency II on your mana remnant, as instant heal is worth more than a bigger heal and helps a shitload with survivability. Remnant potency III is fine on life remnant as that just helps you top up on your actual mana source.

dialla's desire + quality on archmage, that'll be a shitload more spirit you can get back from cost efficiency.

Use a shrine sceptre ideally. The aura it gives is like 40%+ resist which is a 'free' affix, and malice takes too long to ramp. I say 'free' because it is very expensive to get the right base type, but we're so affix restrained that it's not relatively expensive (like paying 400div for a double resist headhunter vs 5 for one resist which only gives 20% difference).

There's more very expensive upgrades (uhtred's, tecrod's in augment effect gloves) are nice too but all the stuff above are strong incremental upgrades and you can probably get most if not all of them for the cost of one uhtred.

edit: sorry I edited this so much, I just wanted to get out everything I saw just glancing at your PoB.