on't try to make new friends immediately
Just like how a girl could get into a meaningless rebound relationship with a new guy because she can't stop missing an ex, a friend could also hastily seek out the company of new friends upon being ignored by old ones.
You must avoid making this classic mistake of having a knee-jerk response to being ignored by friends. Don't try to make new friends immediately because that friendship will be based on frustration and haste, rather than similar likes, common interest and trust.