When asked how I go about playing DbD, first off, I don't go about one strategy. I may have a default strategy when I'm getting exhausted at the end of a stream but otherwise here's how I go about the game as a Survivor. Keep in mind, this is strictly my strategy in the like 4 months I've been playing this game so, don't come for me in the comments as I'm not the all-powerful DbD master authority.
1. Choose perks that help YOU and your gameplay.
Yes, all perks can benefit you as a survivor (and even your teammates) in some type of way, however, as you progress and grow in the game you'll find you may outgrow some perks and along the way, you find perks that now work better for how you're mostly playing the game now. For example, when I first started I had some trouble finding the generators because I wasn't used to looking for them in this game so, I ran perks that could help me in finding them. Once I got used to finding the generators I found I suddenly didn't need much help in finding them, therefore I outgrew said perks. Also as you progress in the game you can unlock new survivor characters and each character has their own unique perks which may be better than what you're currently using.
By choosing perks that help YOU in your gameplay, you can also help your teammates because the better you are and become, the more you're able to help and be beneficial to them throughout the game. If you don't play into your strengths while working on your weaknesses, you're not really going to become a better player, unless you have teammates you regularly play with that know your strengths and weaknesses to where you can fit better on their team as a whole BUT the random matchups you get, your weakness may become more obvious. Also, your usual teammates may move on and find others they like playing with more and suddenly your old gameplay ways leave you having to branch out for new teammates so, become as diverse as you can in this game because it's going to make you a force to be reckoned with where eventually you'll have people that can't wait to be on your team.
2. Starting Strategy.
You may feel that everyone's initial strategy is of course to try and make it out of the game alive, which is nice in theory but it's not that realistic for this game, although you can surely do your best (for the love of DbD though DO NOT DISCONNECT as you'll lose all your blood points and you risk having a game ban). For myself, the initial strategy I often go off of is based on my current challenges in the Rift or Daily Rituals and that's because completing these earns you even more blood points as you complete each one. I am often more blood point focused because that helps to progress your survivors, earns you rewards/charms, ups your seasonal level, and can earn you an extra 1,000,000 blood points on the 13th of each month depending on how far along you are within that month's timespan, etc.
3. Setting up my Starting Strategy.
I may go into a match where for example, let's say I have 3 generators to complete to get through my Rift challenge. For myself, I'm probably going to prepare by bringing in a toolbox and adding some gen perks. However, I also have to prepare for a "worst case scenario" because often I'll go into a game with my starting strategy but that quickly changes based on what's happening throughout the game... this can happen quite often as sometimes it feels like I'm 15 matches in and I'm just now completing my challenge. If I were to end up in a match where I constantly have to rescue the other survivors, I'm not going to be able to finish all my gens. I could also decide to not help my teammates at all and hope I can hatch out the game, but since I'm more blood point focused it's generally going to be better if the game lasts longer and I work to save my teammates for as long as I can.
4. Adapt to the Match.
Ultimately, you have to consider how well your teammates play as well as the Killer and possibly the map you're playing on. You're also limited to 4 perks and any other additional offerings. While it's good to have an initial strategy, prepare for the unexpected and switch up your gameplay for each game you're playing. Don't continue to play the same for each match you're in because you're limiting yourself, and you're probably going to end up hating this game really quick because you haven't learned to adapt to what's going on during the match. You have maps that are dark or bright and some with ample hiding spaces and vice versa, just like you have people that are amazing at playing Killer versus ones who are new, and the same goes for survivors, on top of often not knowing their strategy or what their goals are (we've all had survivors point us out to the killer and some who want us to hatch it out of the game, etc).
5. Have Fun.
Win or lose, have fun with this game, and be sure to mix it up and experiment with new perks to challenge yourself with. Even if you end up a sacrifice you still earn blood points in the end (unless you DC of course) so you're not really a loser, especially if you're completing your challenges along the way too. So many times I'll finish my challenges but I don't survive the match. Other times I may be an early sacrifice but I still get a higher final score than some remaining survivors. There are so many ways to become good at this game or find the bright side to it and score lots of blood points in the end so, don't give up just because a game is challenging for you, that's the point of a game really.