4 weeks off from running and 6 weeks from lifting is a little on the long side if you’re not doing anything else.
At the conclusion of a yearly plan, I like to see my athletes take 2 weeks completely off and then do 1-3 weeks of unstructured physical activity on there own. The guideline for the 1-3 weeks of unstructured training is to avoid anything we’d done during the training year but to do some form of activity for 3-5 hours a week.
We also take 3-7 days off (depending on how extensive the schedule was) following the conclusion of the indoor season.
what you think of doing some bodybuilding? maybe even limiting it to the upper body if trying to give the legs some more rest.