Option 4 is probably the best way for most people as some CEX delisted Monero like the case with Kraken in UK, so getting LTC then swapping it to XMR is the right way imo.
Cash by Mail might be expensive due to shipment fees and have its risks https://libreddit.bus-hit.me/r/Monero/comments/ow7xws/tips_on_using_localmonero/h7hohej/. The guide for reducing risks by Localmonero Staying Safe With Cash by Mail — LocalMonero. I see only people from US benefiting from it the most because of USPS policies.
Atomic swaps sounds interesting but it is a new technology that has yet to be explored. Remember that a PG member has to test a service themselves before recommending it.
LTC as it has lowest fees. https://libreddit.bus-hit.me/r/Monero/comments/1ajqtze/cheapest_btc_xmr_swap/kp2vhms/
good (non KYC and cheap) service for swapping that first currency to Moneros?
you don’t have to leave the website at all and only interact with it rather than interacting with the swap exchanges, it’s basically like a proxy between you and the exchanges.
Orangfren only checks the rates and redirects you to those swap exchanges.
source.