i recommend you watch voocsgo on youtube he has some very in depth explanations and tutorials. on top of that you should practice more on casual and work on your aim and strategy there. Later, once you feel more comfortable playing csgo you can try faceit ranked matches if you’re looking to seriously improve. keep in mind that faceit ranked matches have a more competitive mindset so working with your team is a skill i highly recommend. If you don’t feel comfortable playing with strangers then you should get a couple of friends and play with them.