I think 5-6 videos a day might be good enough. But it's better to gradually reach that level increasing the count day by day. If you find a drop in traffic, then it's better to slow down.
Schedule your videos over 24 hours timeline and find the best timings to reach more audience. It's better to target 2-3 time ranges where your videos get high initial views.
Diversify your tags. Particularly if you are targeting a specific category, you should target as many small/medium tags as possible to extend the reach. If you keep copy pasting the same tags for all your videos, it won't help much. You should optimize title, desc & tags for better rankings. The clickbait thumbnails still work as long as you don't break any guidelines.