It's a good game but I lost in it when the game decided it wouldn't save anymore and it wouldn't let me load any of my newer saves and it was loading back 15-20 hours into the game so I've just stopped playing

Please just remove every RNG mechanic from the game

Dicerolls are the most asinine thing ever, it's nonsense back from the 1990s where video game makers had no idea what they were doing and tried to create digital versions of tabletop games
Except here is the thing: in tabletop games, dicerolls are meant to represent complex chaotic things, that your TABLE doesn't have the processing power to fully simulate
Computers do. There is no reason to ever use a dice roll instead of just running an algorithm that does a good job of being a model of the thing, with deterministic values.

Here is an example of how you could replace the dicerolls on the counselor phases by something else;
-1 Keep the advantage system the same way as it is currently, the +8+2+1 etc, and the "difficulty" -4-15 etc, no need to change that
-2 instead of running a diceroll calculation from those numbers, just have some sort of "overpowering mechanism"
-3 IMPORTANT: make it so that all critical changes in the situation take TWO TURNS (right now you can use the steal control point mission and just take control away from a supernation in a single turn on a 2% chance of success, by brute forcing it, it's ridiculous)
Instead, create an alert of "a faction is trying to take control of the point, if you don't defend it this turn, you will lose it next turn!"
The point here is that it's all about the balance of force, defending it with a counselor wouldn't mean a guaranteed succesful defence, if the attack is too strong, the attacker can still overpower you.

This would first of all remove all RNG mechanic, all occasions where you "lose big" on an AI just trying a 1% chance of success every turn, remove any need to "savescum" (as an optimiser I can't stop myself from rerolling the game almost every time I lose a diceroll just because the opportunity exists which is one of the main reasons I don't play this game)

This system would secondly make the earth-based game completely deterministic, as any strategy game should be (imagine if in chess you had to roll a dice to see if you successfully took a pawn, jesus christ)

It would create a struggle with the other faction based on ressource management, optimising your forces, chosing either to launch many attacks on the less protected assets of the enemy, or, to bunch of your ressources in overwhelming attacks the enemy can't stop even if they try

Thirdly, having all factions lock in their moves at the same time before a "resolving phase", now with deterministic results would create gameplay very similar indeed to the massively succesful and popular strategy board game "diplomacy", the favorite game of presidents, politicians, dictators and strategists the world over for the last few decades (it's doing something right)
If you don't know about that game, it's very similar to the terra part of terra invicta, 7 factions, who all have assets, each of which can do one action per turn, locked in before a resolving phase.... except there's no diceroll, and like the system I propose, it's all about the balance of power. If more armies attack into a tile than armies defending it, the attacking armies succeed. That's all. And it works very well. My suggestion is then to do something similar, while keeping the already existing + and - advantage system, that currently is used to generate a diceroll chance.

There are many other issues this game has but one thing at a time, I see the presence of these dicerolls as by far the biggest issue, that completely kill it as a strategy game, dicerolls just don't belong in strategy games, just ask any EU4 player what their opinion of sieges is, well terra invicta is a game where the CORE GAMEPLAY is to roll 6 EU4 sieges per turn for each faction, no wonder strategy minded players shun TI. It's a shame, this game has a lot of potential, but dicerolls are just such a catastrophically stupid design decision that their presence alone completely ruins any interest people who enjoy strategy games would have in it.

I do not recommend this game.
- very static
- monotonous
- almost real life pace
- level of enjoyment gets close to zero, once you realized how long it took you

Reasons to play:
- grand strategy
- interesting venue
- you are comfortable with the fact that play through takes 1000+ hours.