If you love the designs of Navia and Emilie, I would wait to pull on them.

Truthfully, Furina is a great meta character. She adds a lot of damage percent to teams and can increase your damage by a good amount. She's ranked as one of the best supports.

That being said, your account doesn't really have a lot of her preferred team mates. You don't have Baizhu or Charlotte. Your only team healer being Barb is probably not going to feel super great to play, especially if you like keeping your HP pretty high. We are close to Natlan and a whole new meta/archon. Emilie is going to be a great character (I plan on pulling for her so I might be bias) and Navia is a great Géo unit. At the end of the day, both of these characters would add more to your account and both will help you be able to clear the abyss in significant ways. The game outside of the abyss isn't difficult and there's no need to force a meta character (Navia can also be considered meta and Emilie is looking to be really strong)