You are doing great! As long as you run consistently, you will get faster. But, here are two tips that will help.
First, take at least one rest day (from running) a week. Your body needs time to recover. You are pushing pretty hard.
Second, to build speed you need to run fast. Take one or two days a week where you can cut your run to 5-8k. Run your first km at a very easy pace. Then, run 400m at faster pace followed by an easy 400m. Do a total of 4 fast 400m, then finish your run at an easy pace. Your pace should not be so fast that you cannot do all 4 400m at the same fast pace. After a few weeks of this, you can either start to add one 400 a week, switch to 800m repeats, or just mix in some fast pace running in your regular runs. Any of these strategies will help you gain speed.
Caution: Any time you increase either distance or intensity, you risk injury. Running injuries aren’t like a broken leg. They usually start with a little ache or pain that doesn’t get better. You really have to pay attention, and if something starts to hurt that is different than just sore muscles, you have to back off and take a rest day or two. Also consider massage.
Good luck! And, don’t push two hard. The greatest gains come from consistent training. Runners continue to gain speed for the first 10 years they run.