1) Very important - find good, active event allies! You don't need to meet the requirements on your own, much less get to 1 million. o-o Just have a total LP (TLP) of 163750, or whatever the final requirement is--typically around that much. If you didn't know, TLP is your LP + 20% of your event allies' LP. I have
never struggled to finish an SLBP story event, thanks to my event allies. Heck, I've even had time and TLP to do extra routes for the closet and hearts. (Sorry if this sounds like bragging, but I really don't think this would be a problem if you had decent event allies...)
2) Secret Trysts - I have two sub-points for this one. Since you say you check in every 5 hours, you must be a pretty active player already, so these are just a couple of tips to maximize your LP.
- Fever - Check the schedule and take advantage of fever times! Make sure your stamina is full or nearly full at the start; that way you can make the most of it. :)
- Be careful who you go up against. You want to shoot for "Perfect"s if possible since those will get you a nice 250 LP every go. If you're a new player, this might be difficult, and you may get "Good"s more often than not if your item score isn't that high. I generally choose opponents with no background or much fewer LP than I have.
3) In case you are, in fact, new to the game, I have this piece of advice to give: You might want to hold off on joining story events until you've built up enough coins to purchase the mission avatars. At 2.5k coins per route, it comes out to 15k for six, which may be pricey for a new player. Of course, you earn coins while doing Secret Trysts, but that might not be enough to replenish your supply. And don't use pearls to buy these.