Yeah! So basically think of DLP sort of like Blackjack. You wanna get as close to the required Voltage as you can, preferably without going over. I'll start by sorting my cards by appeal and making a guess of how much appeal I'll need to be able to get enough voltage to complete the song, and do a test run. Let's say for example the required Voltage is 100,000.
If my test run gets me 86,000 Voltage, I'll wait until the last note, then pause and quit the song. This because the biggest piece of advice I can give you is that if you play a song in a parade and quit before it finishes, there's no penalty whatsoever. Your cards keep their PP and you're not spending LP to play the songs in the parade in the first place. I'll then change my team to higher appeal cards. If I were to score a decent amount over the 100,000 requirement, I'll quit out and pick lower appeal members. You just keep trying that until you find a comfortable amount to complete the song. Since the voltage requirements will scale higher and higher as you go through each parade, you'll get to a point where you're just trying to build an "optimal" team, which is why I recommend saving any PP recovery items for your cleansers.
This is a fantastic point for me to backpedal and mention other good cleansing cards. DLP is a fantastic reason to buy Cryptid (or Princess of the Palace) Kanan from the SBL shop, or make use of the Love U My Friends Emma SR or Rainbow Rose Karin SR if you have them (since all 3 have cleanse skills that go off when you switch strategies. The only difference is Emma's goes off 23% of the time, Karin's and Kanan's goes off 20% of the time, and they're usually seen as inferior to Angel Riko who has a 30% chance.)
If you also have the Flower Symphony Kasumi UR, the Fruits Parlor Nico SR, or the Sore wa Bokutachi no Kiseki Nozomi SR, those are a different kind of cleanser we call SP cleansers, because their cleanse activates when you activate your SP skill. Since you need to build up your SP gauge by tapping notes to activate their cleanse they aren't seen as being as good as switch cleansers, but DLP means they can be really important to have if you ever think a cleanse would really benefit you, and you're just not able to use your switch cleansers. They all have a 50% chance to cleanse on every SP skill you use though, so that can be useful!
Just remember that, of course, cleansing never works on base debuffs. No matter the cleanser, no matter the debuff.
Another great piece of advice I can give is that every parade (except for the R on stage one) will come back the next time DLP is available. Your progress is saved, and the PP of all your cards replenishes every time DLP becomes available. Speaking of PP, every parade has completely separate PP from each other. For example, if you were to use up all your PP on all your cards in the Aqours parade, you could go to the Nijigasaki parade and all of your cards would have full PP. Super helpful to remember you can do every parade in the same DLP period if you want!
Typically halfway through the event period you'll be able to do a team restoration for free. This will restore the PP of every card in every parade when you use it. This means you can basically play every parade twice.
If you're specifically looking to try and clear the R on stage parade, I'd recommend just focusing R cards since they get 3 PP instead of just 1, and start using your URs once you completely run out of PP on all of your R cards. Even if you're out of R cards with high appeal, I recommend still using the R cards with low appeal so you can get through as much of the following song as you can.
As a refresher, to put all that together: Start with your R cards and guess how much appeal you'll need to clear a song, then do a test run. Quit out and raise or lower the appeal of your team so you can be closer to the Voltage requirement. Repeat until you run out of R cards, then start using your other cards. Once you completely run out of PP, use your free team restoration and repeat the entire process again. Save your PP restoration items for when you really think you need a cleanser, and remember what cleanser you're comfortable with using. Once you're done, you can still use your PP in your other parades to do them during the same period.
Hope it helps!