Unlock Breakthrough Nodes carefully, and afterwards make sure that you have some upgrades that are guaranteed (only money needed). By doing this, while you research those upgrades you will have more time to get the extra Research Points needed for future upgrades.
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Farm difficult Challenge missions for better rewards including money and Research Points.
When you see the option to scan an enemy appear above their head, capture that person by shooting down their weapon. Captured enemies are worth more points, however their monetary or Research Point rewards will not change.
Research Points are required to unlock Breakthrough Nodes without spending too much money. The more Research Points you invest in your research, the higher the chances for it to succeed. Invest at least 30 Research Points in every research to maximize your chances of success. If you fail, you will lose money and Research Points. The easiest way to earn Research Points is to complete the Daily Hunt missions.