Reddit mentions of ATF147 - Solos for Violin (All Time Favorite Series)

Someone mentioned learning vibrato on their post - in my opinion, I'd hold off on vibrato until you have good command on first/third position, or even much later (after mastering different bowing techniques). This is because it's easy to get into a bad habit, which is the last thing you want for your vibrato.

Otherwise! I think knowing your scales would be a good goal. First octave major, minor, melodic/harmonic minors, along with arpeggios makes for a solid foundation. Usually I'd learn/memorise these in accordance to the key of whatever piece I'm playing. You can play them with different bowing permutations, too. After you're familiar with them, you can start increasing to two octave scales. If you play scales as a warm-up for about 10 minutes each day, I think you'd see a significant amount of progress by the end of a year. In addition to scales, I would practice sight reading. This could be done with using an etude book, or picking a passage from a piece you haven't played yet.

Apart from the Suzuki books, I don't think I really played any other classical music that was outside of the books until I got up to book 6 or 7, when I learnt Accolay's Concerto in A minor. It was the first major concerto that I performed. I distinctly remember learning Polish Dance by Severn (this was really fun), Liebeslied, and Bach's Partita 3. I also used Carl Fischer's Solos for Violin once in a while. There's a few similar pieces that are within the Suzuki repertoire, but also quite a few that aren't. In addition, you could take a look at the RCM Violin Syllabus that outlines repertoire/techniques in grade order. Obviously, you don't have to follow it to a T, but it could be a good method for setting goals and measuring progress.

My teacher had me focus a lot on etudes/technique books in conjunction with my Suzuki books. It wasn't until I switched teachers after five years with my first one that I started playing repertoire outside of the Suzuki books, so I can't really discern what would be realistic goals for classical music in the early stages of learning the violin. However, if you feel inclined to learn etudes/other studies, I'd be happy to recommend some books!