From my experience the fastest way to max out those romance options starts with efficient daily interactions its all about the timing really you want to talk to each candidate every single day which nets you 20 points but make sure you dont interrupt their animations or youll only get 10 watch their movement patterns, some of them have really specific routines

The most time-critical part is gift optimization since youre limited to two presents per week focus those gifts around birthdays for that sweet 8x multiplier and stick to reliable items like gold-quality fruits or coffee especially for harvey and sam a pretty interesting detail is that while prismatic shards are amazing gifts, haley actually hates them so maybe keep those for someone else

The real optimization comes from festival timing, particularly that flower dance which gives you a massive 250-point boost dancing with someone there is basically like a week of regular friendship building at 8 hearts, you'll need to grab those bouquets from pierre for 200g each and while you can date everyone simultaneously, just watch out for that group event when dating all the bachelors or bachelorettes at once they tend to get a bit upset about that

Keep tracking those birthday patterns carefully, like abigail on spring 13 or penny on summer 2 and remember rainy days actually make it easier to find certain candidates since they stick to indoor locations the whole system stays active even after marriage but picking a spouse does lock you out of further dating so timing that decision is pretty crucial