Mar 2, 20181 'proactive', and by extension proactively, are correct. I need to explain the difference between "proactive" and "preemptive" and come up with a sample of the proper context of each word. To "be proactively available to help others" means the author wanted to insert the term "proactive," a positive term in managerial circles, into a phrase where it is unnecessary.
Yes, you can proactively look for a solution but use an idea put forward by someone else.