Difficult Starting

My Lumina 94 APV has been parked for a couple of months and without knowing ,my battery completly discharged caused by the inside light was left opened.So when I try to start I had to change the battery cause it was not charging anymore and now everytime I start my car I have to crank for about 4 or 5 seconds,And then it's fine until next starting.
Any idea?

How big of a battery did you install? Sounds like you need a bit more cold crank amps battery.

Changed the fuel pomp,fuel filter ,battery it's ok.And still same problem.