Heh, I don’t know if you want to spend time making all these compatible... but here’s the list

Additional Traits*
Svafa’s Expanded Species Traits*
United Traits
Xenology- Traits Expansion Reborn
Extended Traits
Enhanced Robomodding
RPG Traits
Gwen's Species & Leader: Adaptations & Techs

The Belt* also adds one trait

No major modifier mods besides Guilli’s and Stellar Expedition. Some small stuff.

Hypothetical Stars* (adds a few)
APSR* (adds a couple)
Potent Rebellions* (adds a small handful)

Expanded Stellaris Traditions*
Additional Traditions*
Tons of Traditions no CO* (patch for the above two mods, and adds Plentiful Traditions stuff, including buildings, also a version with Cultural Overhaul exists)
Buildable Ancient Buildings
Plentiful Traditions 2.0.2 (standalone, different author than Tons)
Expert Economy
Extra Ship Components* (quite a few for a component mod)
The Belt* (adds one or two buildings for asteroids)
TFW’s BOSP (adds like 5 I think)
Stellar Expansion*
Novus Orbis
Ultimate Technologies
EAC New Additions
Enigmatic Technologies

* indicates mods I use