Hinduism scriptures say life of every single human being on mother earth is directly governed by laws of karma, as we sow so shall we reap nothing less or more. In the circumstances there is no point waiting for Kalki avatar to manifest to improve our lot.
As advised by Lord Krishna in Bhagavad Gita, every single human being must indulge in positivity all the time. Indulging in good karma, Punya karma all the time is a necessity of spirit, soul atman within existing in our heart.
Remaining positive we can not only improve our present but also manifest future. We can truly become master and governor of present life by changing our attitude from negative to positive. Between positivity and negativity lay the difference between a king and a laborer.
No doubt Kalki avatar would be a one-man army whose only goal of life would be to re-establish Dharma (righteousness) for times to come. Theoretically as awaited by most worldwide Kalki avatar should be able to accomplish all by oneself, exercising his supernatural powers individually. But in reality the case would be different.
Seeing the truthfulness of Kalki avatar, a crusader of truth almost 2000 million worldwide would become dedicated followers of Kalki avatar followed by another 1000 million who believed in him. Such a massive following would result in Kalki avatar ushering the present Kali Yuga to Satyuga, the awaited golden period.
On an individual level as per Hinduism scriptures one must dutifully indulge in ones karma all the time. Only then we can expect to survive in coming Satyuga. People indulging in vice all the time in present Kali Yuga (Dark Age) would get eliminated automatically. That is how Dharma played its role on mother earth.