need the best topic or niche for my website

i wanna find the best topic or niche for my Q&A website & social medias, self introduction: i hv been the industry of building material for 5yrs as sales manager, familar with products like spa tub, sauna room, steam cabin, shower cabin, acceccories, also ceramics tiles. i thought shower head is ok from my experiance, im not that much like it actually, not quite sure. how about some topics for the entrance exam of Master Degree, like plenty of questions & answers on Economics course? hope your service is perfect to find the sweet spot, maybe you will get topic ideas with: ✓ High search volume. ✓ Low-medium competition. ✓ Location-specific. ✓ Highly relevant and engaging. ✓ Related keywords to the topic. NOTE: not just give me a list with RELATED KEYWORDS + SEARCH VOLUME +competition. kud u plz finalize the optimal decision? need the most proper topic for my situation only