You are correct. Moon trine Venus is not particularly important by itself, other than it bodes well for the native, which is no small thing [ask someone with Moon
square Venus
]. But an aspect beween the faster moving, inner planets is important because their energies can be known to you consciously in your everyday life. And, of course, your trine is important as it can unlock the door to the unconscious energies of the grand square.
Venus, ruler of attraction, relatedness, and the Other, is posited in the sign that it rules, so it is very comfortable in Taurus. Your Moon is posited in the sign opposite of the one it rules, so it inherently less comfortable. Moon rules our inner feeling life. In its dignity in Cancer, the sign it rules, we are made to feel emotionally safe and secure. When placed in Capricorn, the good mother makes us feel physically safe and secure, which is no small thing. But the mother may also be guarded emotionally for her own good reasons and may lack a nurturing, Cancerian component that is vital for our
feeling okay about ourselves.
You have described in another post that your “... social anxiety is <...> fear of looking incompetent or ... embarrassing oneself in front of others in social settings.” This is Moon in Capricorn, ruled by Saturn, speaking. This is the seat of social anxiety. Moon-Saturn, Moon in Capricorn suggests that something is lacking, that there are obstacles, barriers, to our feeling emotionally secure about who and what we are. It impedes our having what we need emotionally to feel good about ourselves.
The trine suggests that as you continue to form relationships [Venus] outside of the family of origin [Moon], there will be great benefit to you. It means that ultimately you will be called to stand in your irrational fear of incompetence and lack, and to reach around it, beyond it, to relate to others. And in this knowledge [Moon in the 9th], as you try this, test this, and see what happens, you will begin to feel the anxiety fall away. It is not something that goes away over night, but it something that you can begin to experiment with and work with right now, putting yourself in social situations, and then reaching out, instead of withdrawing or contracting [Capricorn]. And part of this prescription is that you must be conscious of how weird or freaked out you are feeling and take note of it, see what thoughts come up, what mental images, and record them, and review them. Also, observe the response of others around you. This Moon trine Venus is a key feature of your natal chart. It is what can stop Alice from falling down the rabbit hole.
You have so much going for you. Good, open mind. Good attitude, good chart placements, too. As you keep your eyes and your heart open to this matter, you will begin drawing the energies of this grand square into service of your greater good.