It would help if you would post your natal and solar return charts, for further detail. That said, having so much in your twelfth house merely reflects what's going on right now: isolation, on a global scale. Your part in it. How it affects you.
Since you're a solar Aries, the Capricorn placements would be square your sun, or just past square to your sun (an April 8th birthdate puts your sun at, probably, about 18-20 degrees Aries. The Jupiter-Mars-Pluto conjunction is currently at 23-24 Capricorn, with Mars moving on into Aquarius at the end of March). That reflects you feeling hindered/blocked by this global event. Since the square will be moving on by your solar return, the actual peak time for these feelings is now and/or slightly in the past. By your solar return, it should be easing up a little.
Under ordinary circumstances, twelfth house solar return placements tend to mean the end of an era, in some sense. They can still mean that under these circumstances. If something in your life has been naturally coming to a close, that's reflected. If nothing was naturally coming to a close, the pandemic is probably forcing it to happen. For everyone, it's the end of an era. Everyone who lives through this time is going to divide their life into BC (before coronavirus) and AC (after coronavirus). History might even name this era after it.
Moon's placement in the solar return chart shows your emotional focus. Eighth house might indicate fear of death--either your own or that of loved ones--or facing it as a very real possibility. It might also indicate financial concerns, money and resources that you either owe or are owed, finances being a focus. Second house sun could also reflect that, especially if sun and moon are in opposition along the second/eighth house axis. Security concerns are up for lots of people right now, and financial concerns, too--no surprise if that's a big focus for you! Eighth house moon can also indicate the emotions stirred up by living through a turbulent, traumatic event.
That is not to say you or a loved one necessarily will die of coronavirus (or anything else) or that you will be plunged into poverty, just that your emotions are likely wrapped up in those kinds of concerns.
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