The starter motor may not be the issue - battery could be duff, alternator may be acting up leading to flat battery, faulty earth etc etc
However simple approach
Give the battery a charge for at least a couple of hours - note the position of the needle (if there is one) on the charger when you start and 2 hours later.
If the battery is flat it will charge at a high rate initially, tailing off with time
If the car starts that eliminates the starter motor - the battery may be failing (even although it has taken a charge) or the alternator may not be charging correctly.
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