the LTD idea gets thrown around a lot but be careful with it if you actually plan to keep and scale this. true lifetime deals lock you into supporting those users forever off a one time payment, and the LTD crowd is honestly the cheapest most demanding segment you can get. they'll bury your support inbox with feature requests over a $49 they paid once and never again.
if the goal is just quick cash without wrecking the biz, i'd do an annual prepay instead. founding member deal, something like 40% off but paid upfront for the year. same lump sum roughly, no lifetime baggage, and now you actually have MRR/ARR which fixes the whole valuation problem people keep pointing at.
fb groups are mostly dead for this now, everyone selling and buying moved to X and a few acquisition discords. but real talk, if acquire already approved you and you dont really want to sell... just leave it listed with a high asking price and go grab a handful of paying users in the meantime. a seller who obviously needs money fast gets lowballed every time, buyers can smell the desperation and they wait you out.
on the interns thing, managing dev + AI + marketing juniors while also being the one doing marketing is gonna swallow your week whole. i'd keep it to one or two people max on the parts you genuinely cant do yourself, otherwise you become a manager and the actual promotion stalls.