Both game compatibility and sound emulation have improved, and are a lot better, with some games (ex. Mother 3) no longer crashing.
There are still a few bugs left to fix, such as sprite flickering in certain games.
Google around and see if someone's made a save editor.
If no one's made a save editor, then you'll have to reverse-engineer the save format on your own. This could potentially be very easy, or it could be borderline impossible.
Just a few weeks later, the DMCA takedown hasn't changed anything.
Use the latest official Citra if you want a polished experience.
Use PabloMK7's fork if you want more mod support.
etc. etc. etc.
only ps5 updated to latest firmware can go on psn, jailbroken ones just don't use psn or they risk getting flagged or banned, altho spouting profanity in online play alredy does that