Medical Student Travel and Cashback

CREDIT PROFILE * Current credit cards you are the primary account holder of: * Discover IT Student $7500 limit, July 2022 * FICO scores with source: Transunion 798 * Oldest credit card account age: 4 years * Cards approved in the past 6 months: 0 * Cards approved in the past 12 months: 0 * Cards approved in the past 24 months: 0 * Annual income $: 50000 (parents fund my life in medical school, eternally grateful) CATEGORIES * Ok with category-specific cards?: Yes * Ok with rotating category cards?: Yes * Estimate average monthly spend in the categories below. * Dining $: 200 * Groceries $: Local grocery store: 300 Target: 100 * Gas $: 100 * Travel $: 400 * Using abroad?: Travel to india annually * Other categories or stores: I can use on rent, subscriptions, uber eats, etc. * Other spend: Gym and Spotify subscriptions * Pay rent by card? Yes, amount and fee: 3% PURPOSE * Purpose of next card: Travel Rewards * Travel rewards preferences: Delta and United (split between my boyfriend and parents) * Cards being considered: Chase sapphire preferred, flex, freedom unlimited AMEX gold ADDITIONAL INFO Im an incoming first year medical student (25F) relying on my parents to fund my day to day life. I don't spend extravagantly and only use my one credit card for rent, groceries, restuarants, gas, and household things. Its just for me and I definitely want to maximize cashback as well as accumulate travel points. Ill be visiting my boyfriend in North Carolina (via Delta) and my parents in DC (via United) which are exclusively separate to the airport i fly out of near NYC. These trips will most likely be once a month not including medical school related travel in the future. i intend on visiting family in india annually as well as international teavel at least twice a year. Ive done a fair bit of research on credit cards and im thoroughly confused on what cards would benefit my situation.