At the risk of stating the obvious: when you’re training for a marathon, you run. You run a lot. You run so you’re ready for the marathon. So you’ll achieve your goal.
You don’t bike. (Aside from a little cross-training perhaps.)
If your goal is to retain donors, pick tactics that will help you connect with current donors. Don’t get distracted by engaging new ones.
Ditto for volunteer engagement.
And any other goal you have.
Don’t do the equivalent of training for a marathon by riding your bike.
You’ll never get to the finish line.