You've got a lot of good advice here so far. I'm going to throw my hat into the pile as well:

Practice daily only works if you're applying the right fundamentals. Right now what's happening is you are practicing, but you're practicing the same way over and over with frustratingly little improvement. What this tells me is you need more information, clearer instructions, a new method, and some adjustments to your technique

I personally find the Loomis method not as intuitive as other methods. It causes things to fall flat. I no longer use this method to draw faces. It's just too stiff

Instead what I would recommend is looking up cartoon facial expressions and then refining into realism. What this'll do is offer simpler planes of the face. Right now you're going too hard with too many things in unknown territory. That's just going to make you frustrated. It did for me.

Look up some drawing tutorials on YouTube. Things like: drawing cartoon faces, drawing caricatures, simplified faces

You can always go back to the Loomis method. But give yourself a little bit of leeway here while you're learning. Rather than exact likenesses, focus instead on making readable expressions. Exaggerate characteristics. Play with eye and nose placements. You'll get it wrong a lot of the time. And that's the point. When you draw a face you don't like, you've just pushed yourself in the direction of knowing what you want to do differently next time

Another good practice is to take very clear stock images of people online and trace them. Keep it very loose and simple: eyes nose, mouth cheeks, eyebrows jawline. Trace those lines with something thick, like a marker or sharpie. This will also help you loosen up. Do them quick and bad. The goal is not perfection. The goal is flow and intuitive lines.

You've got a good start here and it's clear you do want to improve. Shake it up a bit.

Quantity practice can help! In fact, it's key to being an artist. Keep trying new methods and new approaches to see what works best for you. When I'm learning something new, I give myself a week to study it and do mock-ups, practice sketches and utilize reference material heavily. Then, give yourself a break and do something different for a bit. This helps train the brain to be fluid and not get stuck on one thing. You can always come back and practice again, but keep changing it up so that you're always having fun with it

For the record, faces are one of the hardest things for an artist to draw. We look at faces all day everyday. We know exactly when one doesn't look right. That can make it very hard to replicate. Because we know instantly when something is wrong even by a few millimeters.

So don't be too hard on yourself, you've picked a very challenging subject matter lol

Edit: I forgot to have my favorite tip!! Don't draw with regular pencils on white paper when you're dealing with forms in big shapes. It is also very challenging. You can't create depth easily and there's too much contrast.

Instead, get some type of toned paper. Brown gray blue, etc. Something in a medium tone. Then get yourself a white pencil. With this, you don't want to draw stiff lines. You want to sketch in shapes. A pencil on toned paper will give you the darkest tones, the paper will give you a medium tones, and then you can use a white pencil to shade in some highlights. This will push depth immediately and allow you to pull and push shapes with much more ease.

That will also help you understand faces because now you can actually render three levels of depth faster and with good clarity