More than enough resources for anyone to improve on LC even if its not a currently available tier in game.
Unlimited resources available online about standard LC gameplay and related stuff, and also there are publicly available test servers where you can test teams with friends.
All of the games from this year's LCPL were recorded so more than enough games to watch and learn from, along with some games from previous LCPLs as well
Also to mention the weekly tours which are conducted by pouf and some other hosts as well to help gain some experience in a less casual environment.
I myself started to properly learn LC towards the end of last year, and i went 6-2 in this year's LCPL with my team winning it, so if i can do it within that time, anyone who is willing to put the effort in can do it, so dont complain unnecessarily and see how you can improve yourself