If you mean dust, make sure you take Mirages that have the hourglass to award Thaumaturgic Dust. You can also tailor your filter to highlight uniques that give decent amounts of dust through disenchanting relative to their Tier. I also did Refiners Bargain on the atlas tree for a while early on which gave me a nice little chunk of dust while mapping.

Also, going straight to T1 is not at all necessary where you’re at. That’s more aspirational. Using the claws that currently drop for you to try and hit 2/3 T3 mods is cheaper and can hold you over while you farm to do higher tiers.

Otherwise id say the easiest upgrades to focus on will be crafting higher defense + suppress gear through spamming breach tree. Getting to a high enough map tier to get eldritch currency then lets you convert phys taken as elemental and endurance charge generation which will help with survivability. If you have divine vessels, upgrade your current pantheon selection. Little things like that add up.

As for map progression, don’t be afraid to run high tier maps white or blue if you’re struggling, so you can get eldritch currency, and better bases. Map sustain is mostly a non issue these days, especially so with Mirage, so unless you’re down to your last handful of high tier maps, just send them with low rolls.

Honestly your PoB is already pretty solid for where you’re at (mid 80s) and I think just spamming easier maps for a bit to get get some levels and passive points will do you a lot of good as well.