Tips to improve Quran reading speed

Peace be upon you, and God's mercy and blessings. I hope all of you are doing well :) I was wanting to get some advice on improving Quran recitation. I started going to Quran memorization circles from age 9 until about 15. I learned Tajweed rules and how to read words, but I wasn't properly taught *how* to read the Quran. Despite that, I was expected to read the Quran in the circles. This shaky foundation always made it hard for me to read correctly. By the time I was 21, I decided to look for a private teacher for myself because learning proper recitation with confidence and suitable speed became a very big goal for me. So, over the past three years, I've had a Quran teacher who taught me from scratch, and praise be to God, I now know how to read properly with Tajweed. The one thing I'm struggling with now is reading speed. People tell me it comes with time, but how much time will it take? I feel like I'm doing something wrong or reading in an incorrect way (like maybe I focus too much on letters individually). I notice that when I practice reading a surah multiple times (without memorizing it), I can read at a suitable speed, but I read very slowly when I read surahs I'm not familiar with. I would be very grateful for any advice you can give on how I can read with more confidence and reach a stage where, no matter what page I open in the Mus'haf, I can read correctly and confidently. And a side question: Should I focus on becoming confident in my recitation/reading before focusing on memorization/joining a memorization circle? Or is it better to combine the two at the same time? May God reward you with goodness and place it in the scales of your good deeds!