i mean if u rly need advice i would prob have to see how u play to give u specific advice
tilt peeking is definitely not good and its just a downward spiral if u keep tilt peeking
do u usually warm up before games? i suggest u spend some time in the range and deathmatches/ team deathmatches before u queue into games
also counter-strafing is not really that useful in val because val has different movement mechanics than cs, although there is no harm in doing it tho
personally i dont think "counter strafing" is the problem, every fight is situational and should be natural, u should not be thinking how to counter strafe in the middle of a fight
personally when i strafe i always have either one of A or D keys pressed down permanantly and deadzone to make myself harder to hit, u dont need to let go of both keys in val
also an VERY important point is having good PREAIM is better than having good aim, if u get what i mean. if u have good crosshair placement u should just be able to click when they walk into ur crosshair, so most fights u dont actually rely on raw aim. if u have to flick like 90 degrees to get a kill chances are ur dead. being good at slicing angles and preaiming at head level is really important in winning ur fights, if ur not used to it at first just make a mental note until it becomes natural
oh and i also suggest finding a good duo that u can rely on, that definitely helps
for the deadzone thing noted(an INSANE ranked demon who shits and terrorizes pros all the time) makes a good video on this about how to strafe recently https://www.youtube.com/watch?v=i_PaUdNxU-Y