Saryn is a warframe nearly as old as the game itself. With many changes, reworks, and refinements made over so many years. Back in my day, I remembered spawning spores on her molt and using the Ignis Wraith to solo Sanctuary Onslaught. But in recent years, the game has settled down for her, and she has her niche. There are many ways to build her, but here are a few recommendations to try!
Saryn Prime Build Recommendations in Warframe
Below is a general-purpose build you can try for her normal and prime variants. You will need 2 forma, including an Aura one:

This build is aimed at keeping her alive with Regenerative Molt. Utilizing a high duration build, with Molt Augmented picking up the pace in power strength. As well as Archon Continuity for toxic lash to inflict focused corrosive stacks if spores are not active.
Below will be a Spore-focused Nuke build for her:

Throw all of the duration away and go all in on efficiency, range, and strength. With Arcane Energize and Energy Siphon to keep Saryn’s energy plentiful. If you do not have the Umbral Mods maxed, you can replace them with their normal variants.
But these are the recommendations for you to try for Saryn and her Prime version in Warframe. I hope one of these helps you, Tenno!