One possible way of adding extra pullups into your routine is to superset them with military press and/or bench press. Basically do a set of military press, then immediately turn around and do some (unweighted) pull-ups. This has the added benefit of helping keep your shoulder stable as well as increasing your pullup count.
"Generally people can't squat because they're lacking in the 'lower ab' area. As in they need to grow a set." - LtL
"No one ever got big or strong by lifting lightweights" - Carl1174
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Valentin Konstantin Platz