Try a balanced deck with one defending building. A balance deck includes low elixir usage such as goblins, minions and etc... Pick also 1 or 2 support cards such as Witch, Valk, Muskt and etc.  Finally 1 or 2 cards for pushing ie, prince, balloon etc. Above all, pray and hope for the best (VERY IMPORTANT) 
That's rare. 

Not normal,  at lvl 5 u should have 3-4 epics by now

a witch is effective too against skeleton army....
but arrow is still the best against them

zap spell when they bunch up on the bridge or swarm around ur giant

It's normal since the players you'll be facing are those from the next arena but dropping...
once they lose to you or the lower arena ppl, they'll drop to the same arena as u

haha u just gotta be better at countering and some luck...
if u can't beat them...most probably u can't beat those better ones in the next arena anyway...
so gotta keep strengthening up your deck

Defend your lane and fight for draw ! Dont waste your elixer on pushing. Play smart !

One barb. Same as how it works for goblins/skeletons etc

Its depend on the Arena written under the chest you received. If Arena 5 then you still will receive Arena 5 cards even tho you drop back down to lower Arena.

Log out kejap then after cool down baru continue   

Seems fine for me. Did some cards of your usual deck get nerfed ? You might want to try another build if that's the case. Or maybe you're just unlucky, we all know those losing streaks.

Normally the first few losses might be due to bad luck meeting a deck which counters yours. Then the emotion of "I must fight back, I must win the next match" will come, making you do silly mistakes because by that time your logical deductions are already controlled by emotions. Best thing to do is rest for awhile, keep telling youself that you don't care if you lose the next match, and that you just want to counter whatever shit the enemy throws at you. Then you will break the losing streak

Source : Myself after countless losing streaks

Why leh? The guys miss me adi ah? I'm tired of the game always giving me enemies which counters my deck perfectly. No longer a question of skill, just outright kena pwned. And the stress of going through all that day after day, damn lol

No such thing. Haha.

too bad me as the co leader until now still haven't get any single piece of legendary card.....

Just keep on playing arena battles. Don't be afraid of trophy losing because you only will lose to a point where you hardly can lose anymore due to that your current level and skill are above that range. 

I played the same deck over and over again for duno how many matches from 1.5k to 3k then only I get the legendaries from the shop and reshuffle most of my deck.  You need to keep playing to know inside out of your own deck. As time goes, it became easier as you met most of the possible deck and know the way to counter them.

Keep the mentality if I lose these trophies now, sooner or later I can gain back again.