Sure there are best sectors for any type of business. Pick a lane (niche) and get in it. Don't change the sector until you have mastered the first one unless an incredible offer is presented to you.

Which niche do you pick? Healthcare? That is up to you. Go with your passion on the niche because you can never be guaranteed of profit. However, profit comes more easily to those who are passionate about what they do.

Best of Luck,
Mike
From the Trenches to the Towers Marketing
I will be glad to help as my time permits.