What Should I be doing under level 30

I installed this game 2 years ago and played it up to level 17, then stopped playing for a while. I am now back to playing it consistently and want to know what I should be doing until I get to level 30 where I can play ranked. I currently play as Shyvana 90% of the time and have her up to mastery level 6. I feel like I am pretty good at using her and playing jungle in general. Should I continue what I am doing or should I be buying more champions and experimenting with different roles? Any other suggestions on what would help me the most while I am still at this low of a level would be great.
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