I am sad to report that after 5 years, I am still exhausted. I think the best answer is to PUSH yourself to exercise as much as you can, regardless how you feel. Don't wait like I did to feel good first.

I tend to push and then I crash, just so hard to,find the right balance

I was that way, also. Had no energy and would tire very easily. Finally, I decided to push myself to start exercising because I had gained so much weight just sitting all the time. It was very hard at first; my BMI was up to 33, which is terrible. I have a lot more energy now and I work four ten hour days (full time) per week. I am still tired after the ten hours, and have a ways to go with the weight. It's difficult, but you learn the difference between tired and exhausted, and you simply lie down when you get to that point.

I , too, after 4 years have struggled with extreme fatigue since chemo. 18 months ago, after 2-3 months if B-12 supplements and not feeling any better, my oncologist ordered a blood test for anti-parietal antibody. I tested positive, meaning that I can't absorb oral firms if B-12. He says this is a result if what chemo dies to the intestines. I now have to get B-12 injections once a month for the rest if my life. Ask your doctor for the test..

I am a year out from radiation therapy and 16 months out of chemo. I decided during radiation that I HAD to move to feel good. Except for the week when the burn was so bad I could not get dressed, I have been pushing myself ever since. Days when I don't push, I feel really bad, physically and emotionally. My best days are physically and mentally active but not too stressful. It IS hard to find the right balance. Getting into a ROUTINE helps enormously.
Being unemployed makes it very difficult to have a routine. There is no arbitrary or external deadline. It all has to come from within myself. One must be highly self-disciplined to accomplish even the smallest of goals. Your friends here and elsewhere can lend moral support, but it really IS up to Y O U .
Good luck! Hugs and prayers!