Part of the issue you are having is because as people leveled up, interest in lower level runs dwindled down and not enough people were showing up to have the event.
Couple of options for you:
Some of the posted events while they may appear to be higher level, may be able to take lower level players along (the morning regular undaunted runs, some of the AVA for example) If level restrictions are not posted. then ask the event leaders and they will let you know if there are level restrictions.
You can always organize your own events, although I believe you have to participate in some events before you can post to lead one. If you ask some of the higher ranking people, they may be able to help you set up some runs.
Impromptu runs, as long as you have 4 or more guild members in the group, can also be claimed for participation. So shout out in guild (or get on Vox) if you want to start an unscheduled run and you may be able to get enough people together.