It's not possible to open the chart you offered without a link, and it's impossible to read as it stands. My offer of an explanation is therefore in a general sense.
The sesquiquadrate aspect is by no means 'weak'. It comprises of a 90*+45* aspect, which most astrologers who work with them would place under the 8th harmonic. I believe in numerology that 8 has something to do with eternal continuation... it's symoblism is without beginning or end....rather like the constant twists and bends on a race track that can be easy or difficult to manoeuvre.
Perhaps the best image would be to imagine yourself attempting to move within such a track and the ease/difficulty with which you find yourself confronted.
Moon represents familiarity and habit. It's what we do automatically
without a first, let alone a second thought. It represents our emotional response to outer influences. Consequently, it is not active but receptive of nature.
Sun and Jupiter are both active of nature. If they pitch a ball of their qualities at you, how does it impact upon you? How do you respond to it through your Moon?
The 90* part of the sesquiquadrate could be associated with the conflict/challenges the Moon faces in dealing with the curves of the track or the ball. The 45* degree part could be associated with the effort put into meeting such challenges. The 'What's the point, everything I try does not work', OR, the 'It can work if I'm optimistic (Jupiter) and put my back (Sun-ruled
) into it.'
The rest is up to you.