This guy on youtube AMS has the gratest advice on OLD imo, I use it, I can tell you it works. Another good one is Andrew Ryan. I'll provide you some links.
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It's actually too much information, let it think in there.
General rule is don't text them on dating apps after 6 pm, that's when those girls get online anyway, and get all their attention cravings, bad time to message women, avoid. On weekends you don't even show up online, from Friday 4 pm, until Monday 10 am, forget you have OLD profiles. I do one text message per day, I show up online one time per day, and run the low interest game on them, it works. For opening I prefer "Good afternoon, my name is Sean, what's your name?" even if she has her name in her profile. Pickup lines in the last link also work, but not as good, that one line there about meeting always works for getting her number or setting up a date.
As far as you trying as try hard by waiting, nah. You should come across as high value busy guy that has his sht together. On your phone you got settings to disable notifications, just use them. Women use them, for some reason most men don't. Just turn off notifications.
By far getting dates online is an easy part. Approach each date with sht test mentality, you are sht testing her whether she shows up on time or not. Don't be rule hard ass either, she totally might be late 20+ minutes, you gain nothing by having rules on this one or leaving early. With online dating being such a crap place you gotta lower your standards a bit, perhaps down to 30 minute wait time. If they busy or forgot you handle it by texting something to the order of 'ok, let's do it some other time then, I got my friend's b-day later, I don't want to miss it', something easy and simple.