The democrats have effectively no power. They control neither the house, senate, or presidency, the courts have become more conservative, etc. They can only talk. The filibuster will prevent new laws, but that isn't much when the federal government acts according to the presidency, and the filibuster does not prevent government appointments
And the filibuster is nothing more than a polite restriction that the majority of the senate places on themselves — they are free to remove it if they wish.