[Noble713]

Try to increase your reproduction rate. You can build climate control facilities and move your people there so they breed faster. I think the Organic and Religious techs have facilities that can increase reproduction as well. You really just have to wait.

Most colonies don't need large populations. Generally only colonies with breathable atmosphers and shipyards, lots of mineral production (over 10,000), or lots of research need high pops to boost production. There is little to no point in sending 200M ppl to the tiny world with no atmosphere and a single Intel facility.