was pretty fun to see but i think you should consider selling your rarity and then buy a sage the mana regen and xp bonus will make the everything a lot faster.
The best mana and spell build comes from the Ultramarine set which you can easily get for free in the Seavale Reef over next to Selchar. It's level 59-65 but the set pieces themselves will give you a combination of intelligence, spell damage, loot bonus, and mana regen while the set bonus will give you even more of those stats. The water damage bonus also helps with the Lightbender subclass further along the line. The only negative stats are melee damage and thunder damage, neither of which really affect you (to my knowledge). It does require a lot of Intelligence so be prepared for that. Anyways, while you're in the Seavale Reef various items are rapidly dropping on the seabed all around the area and you can pick them up. Most of them are to be traded with the Treasure Merchant in Selchar which gives you a lots of emeralds but Ultramarine set pieces will also drop on occasion. Either way, spending a while doing that will probably just give you enough treasure that the emeralds you get for it can be used to buy the remaining set pieces in the trade market.
About using light bender on top center of the screen you have 2 balls that change colors, those are the ophanim orbs hp the more they attack more hp they lose and you can use heal to regenarate theis hp because recasting ophanim is expensive, so you want to heal them to spend less mana and also damaging enemies with sunshower
For making builds you should try the Wynn builder and Wynn item data. Also for builds there are untradable items from boss altars (and dungeons and quests)
Watching the first part of the video rn, using the regular trade market search feature instead of the wynntils one would show all the items that has the word u searched for instantly :D
For acessories i dont recomend you putting level cap on search a lot of acessories are used even with lower levels, there are loads of late game builds that use lvl 60 acessories for exemple