We almost have the same solar return chart. I also had jupiter (and neptune) in 1st, venus, mars and moon in 7th and saturn and pluto in 12th. I also had very large 1st and 7th houses. I'm a Cancer sun at 24 degrees tho.
But I don't know I've been trying to understand the chart too, the 12th house can be detachment, escapes, secrets but also mental health issues :/ . But pluto is secrecy as well and in my case I have been very secretive in my life and I have removed most of my social media accounts and cut off a lot of people from my life. The SR sun was also in my 6th house and some people say that it is bad but it just means that you will focus on virgo things such as work and health maybe not super fun but it's not hard.