The quests stop when there are too few free star systems around - if you liberate more, the quests should begin to appear again. Text quests are not limitless of course, but assassination or similar contracts are infinite I think.
In my game clissans occupied the entire galaxy except one system, so it's a good thing that in your game rangers have an upper hand. SPOILER: However you need scientists to develop the mental communicator and then find Makhpella yourself for the peaceful ending, so rangers and other NPCs may clear the galaxy quicker in your game and you'll get the default one.
You can deal (there are at least two ways) with Makhpella and continue playing in the liberated galaxy, the game will end when you report to one of the ranger centers (the quicker you end the game, the larger the final score will be, but you can continue playing if this score is not important for you).
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