since you do not want to sell your properties or rent out at all (which does not make any sense)

(1) you should clear your personal loan.
(2) Have other sources of income: invest in reits, quarterly payouts OR
(3) invest in businesses. 50k is not much but i think u can jv with people OR
(4) www.clickbank.com Dont know if it's useful anymore but can try lo

Good luck. But follow majority's advice. Sell first house if possible.