how do you get more points some how mine are going down and its dropping my rank rlly badly
The Free For All room is the only room that will affect your ranking. Only players that have created an account will be taken into account. If you play a 1on1 against a guest, then your ranking will remain unchanged. The score of inactive players is shifted towards 75 points. Since you fall below this threshold, you lost a lot of ranks.
Cultris II uses the Elo rating system. In each game, you'll lose some of your points against players who placed better than you and gain points from players who performed worse. How many points you gain/lose depends on your score and your opponent's score. if your ranking is worse than your opponent's, then you'll get many points by beating him, but losing only few points by being beaten.