Hi all! Our campaign is a homebrew setting and our DM has allowed us to go up to level 30 instead of the normal 20, with plans to reach 40 eventually.

Our party's characters are all level 20 already with mine being a Soulknife Rogue 11/ Armorer Artificer 9 split. How should I proceed? What would be the most optimal split? I'm thinking getting rogue up to 13 for the subclass feature and dumping everything else into the Artificer afterwards. What should I do with the ASI's I'll get from the level progression? I'm thinking resilient CON for one of them but after that I have no idea.

I already have a lot of feats cause my rolls were great, didn't have to take any ASI's

STR 10, DEX 20, CON 16, INT 18, WIS 16, CHA 15

Feats: Magic Initiate, Skilled, Skill Expert, Observant, Sharpshooter.

What do you guys think?

Edit: Fixed the split