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I'm not sure why you would want to hold an AMEX Platinum if you only travel a couple of times a year. The $550 is not worth it unless you max out the Uber benefit and the airline fee credit, and even then you're about $150 short and then some since the point is to outweigh the annual fee, not match it. If you're a Hilton person, you're better off getting the $450/year Hilton card instead since it gives you a free night or two, $250 towards airfare fees, priority pass, and multiple Hilton credits which could be utilitzed much easier when traveling only one or two times a year. If you're a Marriott fan, I would suggest the Starwood Preferred Guest (free first year, then $95), as it earns 3x Marriott points per dollar spent. IMO you should throw the Platinum idea out in the garbage.
The Chase Sapphire Reseve is a better card than the AMEX Plat for those who don't use lounges or Uber, but unless you're spending $300+ a year on airline incidentials, the idea of using that card is next to useless to you. Yes, you can transfer to UR partners which is great, but are they useful to you? And do you spend enough to outweigh the $450 annual fee?
The Everyday Preferred with its modest annual fee of $95 is a great card... I would suggest it if you fly Jet Blue, Delta or can use it for high value points with other airline partners. Sure it doesn't include any fancy benefits with it, but what it does offer is a TON of points on spending.
I wouldn't go the route of combining EDP and CSP unless you can find one particular partner from each program that is worthwhile to you, for example: earning Hyatt points with UR cards and earning Jet Blue points with MR cards.
If you rarely travel, don't get a travel card. Get a cash back card. If you travel a moderate amount, make sure your travel cards all operate in the same ecosystem. Don't try to mix a UR card and an MR card. Only frequent travellers can make that combo work. I recommend you get a 2% cash back card and use that alongside a card (or cards) with 3% category rewards for groceries, gas, and dining.
I have used this combo for majority of spending when I am not trying to meet MSR on any cards. It covers a lot of categories that I would want bonus on that's eating travel groceries and gasoline. I found meeting 300 travel credits is pretty easy to do. Parking tolls trains Uber that alone makes it easy to meet
This is currently my combo and I am very happy. I started with PRG and EDP and built a bank of MR points. I canceled my PRG for the CSR which is by far my favorite card. It has more than paid for itself last year and just renewed in January. I maintain the CSR and EDP now and get way more value than the annual fee on both. I use CSR for travel restaurants and bars and EDP for everything else to ensure I meet my 30x transactions. I travel maybe 3-4x a year so semi-frequently I suppose, but definitately not enough to find the right value in the Amex platinum.
Having used both MR and UR, I do prefer UR especially with the simple 1.5 redemption in the Chase portal with the CSR. I have yet to find a better suited combo for myself at this time and have about 150k in each.