Hi OP,
I watched about half of your video. I'm not qualified or able to give any technical advice or comment on your NTRP, but I did see that virtually none of the rallies lasted beyond 3 shots and the longest I saw was 5. As a fellow adult learner (I'm a bit ahead of you, I started 4 years ago) I would suggest the following:
- If you can't find a decent coach for a few lessons, go to FYB and look at the forehand and backhand progressions, and then spend some time at the start of each session with your friend practising the full progressions. You won't get instant results but you should both aspire to a technically sound FH and BH which you can then build on. If you don't like the rather mechanistic approach of FYB then Feel Tennis is also excellent. Pick whichever approach you like, and then stick with it.
- Don't spend too much time playing sets or competitive rallies at this stage. You need to learn the foundations first. Instead, try to spend at least 75% of your practice time doing basic drills. Try hitting crosscourt rallies with your friend, both on the FH and BH sides. Can you make 10 shots in a row? This is really hard to do if you are a relative beginner, but try it. Once you can make 10, set a goal of 20. Do the same with down the line rallies, only using half the court. Your mutual objective should be to keep the ball going, not to crush it or hit through each other.
- Practice volleying, maybe 10 minutes each per session. At your level you are going to see a lot of short balls, so being comfortable at the net will be a big benefit to you. The volley is by far the simplest stroke in tennis, but you have to practice a lot to become comfortable at the net.
- Start every session with 10 minutes of mini tennis. Again the focus is to keep the ball in and to keep the rally going, and it also teaches control.
The key is to invest a lot of time at the start learning the fundamentals and developing consistency. I noted in your vid that almost all points were lost by an error, rather than won with a winner. If you can develop the skills to become consistent (keep the ball in play) and the ability to put the ball in the half of the court where
you want it to go, then you will have all the skills you need to compete well at your level, plus the fundamental foundation to move on to the next level.
Good luck and have fun. Remember, tennis is a game for life and you have tons of time to develop a good foundation.