Car batteries tend to have about 30 amp hours of capacity, so if it was totally dead and you charged it at the 2 amp rate it would take, what, 15 hours, so it seems like 24 hours should have been enough to charge the battery fully. Probably what I’d do is take the battery in for a load test. If the battery tests ok and you still get clicks, then I’d measure the voltages at both terminals of the starter motor (compared to the case ground). Both should ideally be above 10.5 volts during attempted cranking. If you got this voltage ok on the starter motor and it isn’t turning the engine, then there is almost certainly something wrong with the starter motor.