Just get miner 50 - farm gold ore, darksteel ore & grade 3 thanalan soil. ( these will always be needed as ppl garden, need gold ore for aetheryte ring desynths/ rose gold cogs & darksteel nuggets etc. )
Then get gsm to sell easy to make yumizuno fishing tackle as it sells well but not much ppl care to look at it. But ppl still buy it for a decent amount of gil due to convenience.
Or weaver and just craft HQ crafting sets ( i.e velveteen, linen, hempen etc. ) they still sell decently due to ppl buying it for convenience.