I've been playing Teysa 1.0 for a while, and my experience has been that building a perfect list for her is very, very difficult - I'm pretty sure that of all my decks, Teysa is the one most in flux by a significant margin. Unlike some generals that have a very obvious direction (ex:
Tatyova, Benthic Druid wants you to play lands), there are a lot of directions Teysa (and Orzhov in general) can go - you can lean into token production, or sacrifice synergy, or take a more controlling route and take advantage of her exile ability alongside Orzhov's great removal. And of course, this is before we start discussing any sort of lifegain synergies or reanimation strategies, which Orzhov can also support.
The issue with almost all of these strategies is that they are generally focused on your board position - either they require you to already have a bunch of creatures on the battlefield, or they merely generate more creatures (instead of some other resource, such as ramping out more lands or drawing more cards). This means that many cards are vulnerable to Wrath of God and other board wipes.
To address the original issue (lots of synergistic pieces that are weak without support), there are several approaches I've taken with my own deck:
-include a few one or two card combos that provide a large impact with minimal setup. I've grown to be a pretty big fan of
Buried Alive ->
Living Death.
-run more card draw and recursion, to make assembling the right combination of synergistic pieces more consistent
-focus on artifacts and enchantments, which tend to be more resilient to removal, and thus more likely to stick around
Including cards that fulfill multiple tasks at the same time also makes assembling synergies easier (ex:
Altar of Dementia is a sacrifice outlet, a win condition, and a way to set up reanimation.
Specific cards I'll suggest:
Dawn of Hope,
Darkest Hour,
Grim Haruspex,
Altar of Dementia,
Living Death,
Grave Pact (+
Dictate of Erebos),
Pitiless Plunderer.
Another approach you could take is swapping Teysa for Krav & Regna, and seeing how that feels. (I once tried to do so, but didn't have enough lifegain in my deck. However, it looks like you have substantially more support for them than I did)