The definitive solo [Trinity] experience:

to proc [Arcane Avenger].

to keep shields up along with blessing as your shield amount will fluctuate a shit ton.

to fully armor strip enemies.

to turbo charge a melee (this can be any +atk speed arcane, melee specifically as [Lesion] has been my [Trinity] go to for years.

to keep our ass never on the ground.

to give you a status cleanse and enough time to recast your abilities.

fits in perfectly with the strength and duration, so would [Xata's Whisper].

This is what I found to be the comfiest version but there are swaps you can do:
Replace [Combat Discipline] with [Brief Respite], [Augur Message] with [Constitution], [Arcane Avenger] can stay or go to arcane of your choice

Also if you are going to be primary or secondary based and want pretty numbers replace [Streamline] with [Champion's Blessing]. If polarities don't allow, use an umbral forma or higher ranked [Combat Discipline]. Or instead of [Champion's Blessing] slot in [Eternal War] and change [Roar] to [Warcry].

Notes:

and [Blessing] have garbage duration scaling: 223% duration gives 26.8s [Link] and a 22.3s [Blessing] While 179% duration gives 21.5s [Link] and a 17.9s [Blessing] at the cost of enough of your range to where common endurance oriented melees setups like [Praedos], [Kronen Prime], [Guando Prime], [Lesion], [Nikana Prime] will all out range your [Link].

As for weapons to pair my personal favourite loadout I use with this is
[Kuva Bramma] with [Primary Merciless] for clearing when i need some breathing room
[Epitaph] with Secondary Dexterity] as my CO primer
[Lesion] as the main dps melee.
Naramon focus tree for more melee bonuses.
[Magus Lockdown] for extra CC