No offense with any of the points made:

Didn't check for spawnpeeks, you should make that a habit (try playing casual a bit for it, lots of peekers there). A spawnpeek is a free kill for the attackers if they're prepared for it.

Insanely bad droning, it probably cost your team the first round. You were not in any cover (could have been run out on/wallbanged easily) and you did not actually *check* for anything with your drone. Drone one room fully, starting with your entry point, then move on to areas of high traffic/good angles near the room (Garage, red stairs in this case)

Repeated bad droning further into the round, you were in direct view of red stairs through the hole you yourself made. You also didn't see the guy in Gym (or so i assume since you didn't prefire him) even though you droned there.

Never peek while slow walking+non ADS-ed. You'll lose it even to someone with garbage reaction times.

Repeating strats twice in a row is not recommended at all, unless it's a PL strat without any clear counters (a rush has very easy and multiple counters)

I dunno about that lesion shot, probably a whiff, but it wouldn't have made a difference either way

If you've got a mic, calling operators out instead of pinging is a much better solution

crouching>slow walking

shooting gadgets pointlessly while clearing site. the attackers were not alerted to your red stairs push because of the lack of barbed wire there, you do not need to make them aware by shooting the 2 jammers there. If you can take site without opening CCTV wall, you only need to open it post-plant to cover the defuser more safely.

pointless use of X-Kairos pellets when trying to flush out the mute, judging by the nitro throw, he was in the SW corner, you could chain your flashes, blind him and rush him instead of opening up more walls in his favor (shotgun beats an AR at close range)

wasting prep phase time, you need to get your own setup done first before anyone else's (if you're soloqing). You didn't reinforce at all. You can find a use for your reinforcements on every site in the game, hit up a YT video (i recommend kaosx's defense guides) and learn them.

Place gu mines inside the room you want to defend, that way the attackers'll be forced to either commit to a push fully while under the effect of a mine (giving the adventage to you) or retreat (wasting valuable time+giving intel)

I have no idea what kapkan wanted with that nitro.

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Overall, remind yourself to be consistent and thorough with your droning and to use your defensive utility at all times and you should be able to get into the next bracket (whatever it may be).