The expression "from time forth" refers to the period from a certain moment onwards. There are several synonyms that can be used instead of this phrase to convey the same idea. One of these could be "from now on", which is a more concise way of stating the same meaning. Another potential synonym is "henceforth", which is a more formal and archaic term for the same concept. Other possible alternatives include "since that day", "since that time", or "from that moment on". These synonyms can be used interchangeably, depending on the context and tone of the sentence in which they are being used.