I have been playing this game for 5 years now, its one of best free time online game for me, haven't spent any single penny on it, but I am about to doorstep to th10, if you are pro coc, and yeah 5 years is like I should be on th11 but I hate being high upgraded and don't play much these days,
-keep on balance, don't hunt for trophies because powerful players raid your base every now and then and get the powerfull base to attack, also clan war will search ratio of total players Exp+trophies which also give you difficult war, basically, you totally fucked up. (i am playing this game for 5 years and yet I am new on crystal league III, and never reached crystal leage II but if I try, I can be much higher that th9 allows)
-with that balanced trophy I to get the best loot efficiency and not much lower level base to attack, so I prefer "Laloon" attack
-never! upgrade your th until you upgraded each and every buildings to the max capacity of th level, not a big problem but you are then upgrading th relatively low power of your defense and troops.
-never go in clan wars! wft! yeah, such a loss when loose war! and every often when you forgot the war, you get kicked from clan