Truth upgrades

You probably have something like this planned already, but I'll suggest some things anyways.

Turn truth into a currency that can be spent between unfoldings on upgrades. Right now simply having tons of wealth don't automatically solve all problems since you run out land. It can be solved by spending wealth on increasing the count of vision buildings for finding systems, science buildings for buying land increasing upgrades, buying actual land increasing investments but the costs on all these scale in their own ways rapidly, leaving you with just a crapton of wealth that you can't effectively spend since you're at dozens if not hundreds of times your land availability.

Solutions: after you hit unfold you get taken to a screen where you can spend truth on multipliers for the core resources. Omniscience for vision, hive mind for science, planetbusters for force etc. Keeping the wealth multiplier without diminishing returns is good because it's essentially the default resource, but doing the same for the rest, especially land, science or vision, would be severly unbalanced. Buying the resources in chunks of saaay 25% increase (stacking additively and not multiplicatively with themself) for an ever increasing cost is probably the simplest way.

Another thing you could potentially have for unlocking is Provost Emperors, upgradable permanent personel that don't buy anything or hire anything, but simply give upgradable (with truth) bonuses to one area of investments. They could do things like increase production, reduce costs or reduce footprint. Maybe each one requires some specific achievement to even unlock to begin with. Reach 1 Q of income for wealth for the wealth one, get 10 science refinements in a level 5 or 6 tech for the science one etc. Maybe avoid having one for the Truth investments because... well... that's essentially the player. Doing things to maximize truth income.