It's a very hard game to get into now, people have put lots of in hours, lots of map knowledge. Nightmare to start vs that and there are many many cheaters.
I'm GE and faceit lvl 8. I've been playing CS since 1999 and starting to get old, reflexes are not as good and I'm just not as good a shot anymore.
I have had to adjust my role as a CS player, I cannot compete on pure aim on faceit, (MM im ok). I have to use my game knowledge/sense and play a supporting role.
It is possible to solo up the ranks I almost play exclusively solo. You have to remember to play as a team, don't a position alone even if you think your team mate is making the wrong move it is better to play together than be killed one by one. Buy and save as a team
Learn some basic smokes and flashes and get your crosshair placement good. There are plenty of youtube videos on these topics. Understand what damage what a gun does and the more effective ways to use them is also a good skill to have.
I haven't opened a case in about 8 years, imo they are not worth it. if the case you have a worth 3p keep them and wait for your stock to rise. if you get a new case at the start of a operation sell it, put that £2 to a skin you like the look of.
last tip is to not play angry, sometimes its just not day.