pp can only be farmed if you have the ability to farm it. Try to play maps that are 0.5 stars away from what you best play now (e.g. if you can play 3 stars now try playing 3.5 stars). That way you will gradually gain skill and pp at the same time. Otherwise if you try spamming a map that has 6 stars a thousand times and got a lucky FC, you will be stuck both in terms of skill and pp for weeks or even months.

Also try experimenting with different mods. HD is arguably the most useful mod you should master at the start, because it gives you a guaranteed consistent boost in pp gain on any map, and if you're simply decent-good at it you should be able to play 75% of maps you can play on NoMod and you'll gain quite a huge amount of pp when it all adds up. E.g. if HD gives you a consistent boost of 15% increase in pp gain, and you have 7000pp now, you can get to 8000+pp easily, that's 1000+pp for playing the exact same maps.

DT is another one to look out for. This mod will drastically increase your pp gain (sometimes even close to double or more E.G. Dusk's play on Adularescent and Akatsuki no Tsuki). However as seen from the example given above, there's not a lot of shortcuts to farm pp on DT other than being actually crazy good at the game. DT on a [Platter] difficulty can give you anywhere from 250pp to 350pp unweighed. The irony is when you get to the point where you are skilled enough to DT FC a 350pp Platter, you would have already gathered 8000+ pp to 9000+ pp through other means if you really inetended to do so. Therefore a 350pp score would give you little to no pp gain at all. Not to mention than most DTs on standard convert maps that gives you even the slightest pp at that point are AR9 cancer maps ON DT. So really if you want to farm DT you should just focus on getting good instead and hope that along the way you meet some rare free DT pp maps. But once you've gotten to the level of the very bests, you can literally gain 2000+ to 3000+ pp gains overnight.

HR is even more of a challenge. Usually HR will give you an additional 0.5 stars to whatever you are playing (on a 4 to 5 stars CTB map). That will not give you a huge pp boost. However on higher star rating maps (5.5 stars to 7.5 stars map) it can give you 1 star rating boost or more, and at that rating 1 more star can easily give you more than 200pp if you do HDHR (E.g. Augoeides NoMod pp VS HDHR pp). Usually HR FCs will give you 50pp to 100pp gain on regular 4.5 stars to 6.5 stars CTB maps. There are a lot of these CTB maps around, and if you could master HR you can gain 1500+pp for playing the same maps. However there's a condition, and that is you have to be so good at the game you can read 5mm bullets raining down on your catcher and catch all of them. So good luck on getting that first.

FL is the most difficult to farm pp. It gives a consistent boost to pp gain just like HD but more than HD. The problem with FL is that it's almost impossible to read/react on high difficulty maps. Even players like Havin YERTI ExGon Dusk don't have more than just a few 300+pp plays on FL. And again when you get so good that you can play 300+pp maps on FL, you should already be able to play 500+pp maps on NoMod like it's nothing, so why bother with FL if all you want is pp. FL is used to mainly win 1st places or to grab lots of Replay Views or to just have fun. It's more like a trophy "look guys I've got this isabe FL score and lolz I just rekt mjj's max spin with FL #1. It's the worst choice to pp farm and I don't recommend anyone to take pp farm on FL as their number one priority.

EZ and HT are usually combination mods if you want to gain pp, like EZ DT, HD HR HT, EZ FL, etc. Mostly when difficulty reducing mods are combined with the right map you'll get huge pp. E.g. EZ DT/EZ FL on Banned Forever [Nogard] and HD HR HT on Genryuu Kaiko [Distorted Scythe]. Don't think that because the name says "difficulty reducing" means it's literally less difficult. EZ makes reading very difficult and HT messes up your speed and rhythm judgement. If you even play EZ HD and HT HD on AR7 4 stars maps you'll know what I'm talking about. If you can master EZ and HT and its respective useful combination you can get quite a fair bit of extra pp (500 to 1500 extra pp). It's an unpopular choice because it disrupts your flow when switching to play its counter-mods (HR and DT), but if you are good at adaptation then you shouldn't have a major problem at that. Bottomline is for this to be rewarding, you have to be extremely adaptable in your playstyle that any weird mod combination odd ARs and CS'es wouldn't bother you. It takes a lot of time so be patient if you want to farm EZ and HT.

Yep that's the most comprehensive guide to gaining pp I can ever give. I hope it helps o/