To save scrolling through the whole list of restaurants, I just put the restaurant name in the search bar and it comes right up, huge time saver.
Enter your cc info on your profile and it will come up during the ADR process and you just have to select it, rather than enter the info again.
Prioritize your reservations, don't necessarily book in the order of your vacation, book them in order of difficulty to get. For example, if you want BOG or CRT, for example, then try for those ones first regardless of what day they are on. Also a good tip to put the hardest to get restaurants near the end of your trip to take better advantage of the +10 on your 180 +10 days to book.
If you are not finding an ADR you want, try selecting a specific time (i.e 6:00pm) instead of just "dinner" or vice versa. Also, try changing the number you're trying to reserve. If you are a party of 3, try for a table of 4, as an example, sometimes an opening will pop up. You will not be charged any penalty for showing up with fewer people than what you have the ADR for.