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PM me for an AAoA forecast spreadsheet to help you analyze when you apply for more credit cards in the future but to keep your AAoA over 24 months. You want to get to 24 months AAoA and keep it there, forever. 24 months is a huge AAoA breakpoint for FICO scoring.
Right now, I would garden but I would definitely go for a prime CC or two as long as new accounts reporting keep your AAoA > 24 months. I'd go for Chase first if you're under 5/24 (I have a 5/24 forecaster spreadsheet too), then look at Amex second if the rewards meet your needs. Discover is a great cashback card the first year (10% categories) so I'd consider that third. But always keep your AAoA > 24 months with new accounts.
No inquiries or new accounts for 6 months before apping for a mortgage.
AAoA data points appear to be less than 6 months (bad), 6-24 months (poor), 24-36 months (first decent point) and then some annual ranges after that.
So you are on the cusp of 24 months. Get there and stay there, my spreadsheet will give you solid forecasts that I use personally.
5/24 is more difficult which is why I had to build that because it's a mental math nightmare. My own 5/24 doesn't fall until 6/19 if I stop apping, but I want Amex Platinum and CSR next year so that's 9/19 or so until I am under 5/24, ugh. So far away.