Video is a too long. Some of your early sequences could be stand alone videos, like the one starting around 3:30. Some of the later sequences lack context, like your near miss head on with the P-38 (great shooting btw). Your accuracy is good but here are some of my thoughts.
First thing I noticed was that the entire video is with a K4 with MG151/20 Gunpods. This gives the plane a very potent punch, but also leaves it a bit slower and piggish. This means that in order to be successful you would need to be surrounded by friendlies to help you because your defensive capabilities are much more limited. What I saw in the video seems to largely confirm this. Most of your shots are on people who are engaged with other German planes and many are actively being shot at by others. Your accuracy is still great and the shots of enemy planes coming apart in the barrage of 20 and 30mm cannons is cool, but few of the shots are technically difficult. What I would like to see is more flying in slightly more risky environments where defensive flying and reversals are more likely. Sequences where some plane is engaging you specifically and not trying to dodge a hail of bullets from 3 different directions. There is a sequence in which you tag a La-5 that is defensive against you but this sequence showcases their inability more than your ability.
The sequence at the very end is more like what I'd like to see where you are defensive and have to force an overshoot, however it fades out right as it gets good. After forcing the overshoot you are low and slow with gunpods hindering your performance while two enemy aircraft just tried to take a swipe at you. Though I feel like I know how that ended, because I've been in that situation before (lol).
Overall, you have great accuracy and this video is a demonstration of the effectiveness of massive firepower used accurately. I really liked your discretion with your shots. Shots are taken with quick bursts. A lot of people who take loadouts like the gunpods used them to spray and pray, making up for inaccuracy. You are using this loadout to make your shots that much more effective, and it works well. I would personally suggest working on the editing a little to trim some of the fat out of some of the clips while trying as much as possible to retain context. Also, a little more action in higher risk situations. And try to keep the videos around 10 minutes max.
I'd say this is an excellent first attempt at a kill montage and you have a good skill base to do more. Bravo!