With Sun, Moon and Venus, plus MC and South Node in Venus-ruled signs -- and especially Venus very strong in one of its own signs -- I can see where expressing Venusian traits is like falling off a log for you... very easy.
But your Sun is part of that Venus thing, so I'm not sure why you feel you have trouble accessing it.... maybe because of the Pluto opposition? Moon quincunx to Sun isn't the easiest aspect for combining Sun-Moon energies -- but not awful, either.
I wonder what it is about your Taurus Sun that you feel you're NOT expressing?
Actually, it looks to me as if the Libra Moon would be more difficult to access -- it's your one and only Air planet, opposing Mercury, squaring Mars-Neptune, plus Moon rules your 12th. Moon trine Venus, tho, is really pretty.
I have this in my chart, too, and it has been one saving grace in a chart full of difficult stuff.
PS: It has been years since I've thought of the South Node as "unfortunate". It's just an energy we express easily, from the get-go. Aries NN might be harder for you. Aries rules your 8th house... counseling of some sort? If so, maybe that's an expression of putting your NN to use.