Video 1:
1. You look tentative on your feet. Find 4 throws that you feel comfortable enough with to try and force. Then work on pulling guard.
2. Your standing guard pass. Put more of your weight on his legs. You got appropriate grips (though it's best to get the gi inside their knees) and really drive your weight so that his legs can't follow you. The you don't have to be acrobatic to pass. You can literally just walk around (and then deal with his hands). Basically think of passing as a process of getting passed things, first the feet, then the shins, then the knees, then their hands, then lock their hips. You seemed to be working on hips while feet were still there or hands, while knees where still there...
3. Bottom side control. You have no good thing that can happen for you reaching your arm up like that. Your hands should be underneath you, and you should be turning into him (unless you plan on turtling in the other direction). Try going for an underhook with your left arm (when sidemounted from that side) and use it to make space.
4. 3:32 That was the easiest mount I've seen in a while. Your right knee should be up in his ribs the entire time so that you feel that attempt and can grab half guard out of it.
5. Decent mount reversal, but you can't give up your back like that. You should maintain control of that arm you use to roll him until you can get posture.
6. Dealing with having your back taken. There are a few schools of thought on how to escape back mount, but all the ones I've seen require that you get off your knees and roll over so that your facing up. You can then try the "scoop" escape by Saulo Riberio or some other variations where you get your shoulders on the mat and try to create a scramble.
7. Top side control. You're a big dude, but you look as light as a feather right there. There's no nice way to say this....your butt is sticking up way too high. Your hips should be connected to his, not so loose. Try getting your arm under his head and then gripping your hands together and using your shoulder to turn his head away from you.....if he can't turn his head towards you, his body won't turn either. Your hip positioning at 5:34 is much more like what you should be doing most of the time.
8. Top side control. I can't fully see where his right hand is (under you), but you should be trying to isolate that with your left knee and then sliding towards his head to allow for hip switch and then mount. You should also look to knee on belly. You seem to like to be away from your opponent, to see what they might be offering. Knee on belly is a great way to do that while maintaining pressure and pushing the action (plus, it's points).
9. Top mount. You might consider grape vining your legs through his legs for added control (you take away from his bridging power) and you should be body surfing him. You have way too much weight on your own knees (so it's not on him). 8:05 Big mistake. Someone paying attention would just get half guard there. If you want to move your legs up, bring your knees up to his armpits.....which appears to be open there. Then your weight is very far from his bridging power near his hips and you can still work chokes or arm locks.
10. Arm bar. Your weight should remain on him until you have your leg over. You were still back already. You should ideally be able to sit down and not have your back hitting the ground, and still finish. Also, you might consider controlling his arm with one of your arms and his inside leg with the other, so he can't bridge into you.
Video 2:
1. You have a solid base. You don't get moved easily, so that's good. You still seem to lack focus on passing. I get that. Passing is freaking hard. Think posture, break the guard, knee in or stand so that he can't reclose the guard, and then purposeful pass.
2. Breaking grips. That's something that you can go to improve right away. Look up breaking grips, using two on one. Also look up defeating the spider guard using your hips and your own grips to get his feet off of you.
3. Again, back escapes. I believe he went to the arm bar twice now from your back, so protect your arms. They should be right by your neck, with your elbows in.
4. 5:03 butterfly type guards have to be smashed. You should move towards him and not be so strung out. You should close your knees on his feet, control his hips with your hands, put your face in his chest and put his back on the ground. THEN you can try getting around to the side, because you've severely limited his sweeping power.
5. The sweep actually worked in your favor. Side control. Again, too light.
I'm getting tired....I don't have much else to say though. Some repeats of previous issues. You need to have a couple of goto moves from each position. You need to feel comfortable with them enough to go from one, to the next, the next and back again. You seem to languish in places where you should dominate some.
Thankfully, your cardio seems fine and you look to be pretty strong. These are good things if they assist your BJJ and aren't all you're about.
Good luck.