rightly said skip.

get the brook asap. and play dd/cl games only. the brook is a money making
machine. and who knows, maybe by lvl 50 ull have enough for balt. i jus barely had
enough for brook wen i 1st bought it. with no armor. but it makes so much money i
got all the armor i needed. and, after buying saliors, trying the cleve a few times, i
still had 1.27 mil for wen the balt game. so yea. BROOOOK!!! NOW!!!!

Play less Op Convoy and many more battles. (especially All Welcome, even if you
sink early, stick around until your team has at least 3-4 million tactical)

The reason you can't afford Brook at Lvl 42 is because Op Convoy pays little, if any
credits.

Also, being in a DD in a battle room means you get the smallest share of the bonus
credits (except for FF). So by staying with that DDX for 12 levels after you could have
had a CL, you've robbed yourself of 12 levels worth of better credits.

I would advise getting an Oakland now to increase your credit gain, unless you are
close to Brook price. Your XP will
likely suffer, but your bonus credits will pick up, and in your case, XP isn't really an
issue.

If you cant make 550K in 42 levels, no way are you going to get to 1.1 million by Lvl
48. If you can't afford an Oakland, you're gonna be in that DDX for a loooong time.
Whatever you do, do NOT stay in that DDX any longer than you have to. The longer
you stay in it, the farther your cash flow is going to fall behind.