what does Ra mean by resonance

[Siren]

If resonance means that we are "the same" then they wish to enslave those who are service to self, as that is what they are. Correct or?

Yes, resonance as in "like attracts like."

But I think you misapprehended Ra's statement. Let me attempt to clarify: what Ra is saying, is that this so-called "Orion group" seeks to bolster their ranks by adding other like-minded, negatively-seeking, service-to-self entities unto their total complex, all the while enslaving the rest—particularly the "lukewarm" (i.e. the non-polarized)—who would be considered "un-elite."

In modern parlance: a few are to be cunning wolves, whilst the majority remain ignorant sheep.

If he means resonance as in what is opposite attracts then he means those in service to others who are then susceptible to being enslaved.

A sufficiently positively-polarized entity cannot be truly "enslaved." Only non-polarized entities and negatively-polarized entities can be subject to enslavement.

What needs to be understood is that the formations of negative-service groups is hierarchical in nature. Therefore, 3D entities learning the way of service-to-self will attract about themselves the influences of "higher-dimensional" negative entities who will teach/offer them the ways of negative service. By its mere position in the evolutionary ladder then, the 3D negative neophyte is then, in a way, "enslaved" (perhaps even unknowingly) by the higher negative adept. Likewise, early negative 4D graduates are subject to mid and late 4D negatives masters, who are in turn subject to 5D, and so on.

However, lower negative entities can "overthrow" higher negative overlord, and thus inverse the slave/master relationship—whether momentarily or more permanently. Negative hierarchies are somewhat volatile, for there is always a struggle for dominance over others-selves even among themselves (even lower 3D/4D negative minions dream of reaching the highest thrones of power—after all, haven't the greatest of all demonic princes evolve out of primordial clay in 1D?).

In a paradoxical way, those who seek to enslave have also enslaved themselves.

Just as those who truly respect, honor and uphold the freewill of other-selves, experience the greatest of freedoms.

Or are you all preparing or being tricked into enslavement as you move into STO in hope of being worthy and guided into what you deem is a better place or 4D...?

I perceive some degree of doubt/fear/confusion in your question.

Let us attempt to explicate the mechanisms of positive/negative service in 4D when two entities, or group of entities, of opposite polarity meet/greet each other. This is what generally occurs:
The positive entity fails to accept the service/offering of the negative entity, which is enslavement. The negative entity fails to accept the service/offering of the positive entity, which is non-enslavement. Thus, both forces repel each other, lose some polarity, and thus must retreat and re-group; leaving each other and continuing on their own path of service/seeking.