DIY user recruiting outside the US (via LinkedIn perhaps?)

So, I keep struggling when trying to recruit users from abroad, I have had the help of the guys from MeThinks in the past, but I'd like to do it DIY style to save some money. I've found recruiting particularly hard when it comes to finding people located outside the US since there are a bunch of recruiting services already for the US. Does anyone have any tips or suggested strategies around this? I often try to target users in LATAM and Europe. Thanks a lot in advance! <3

PS: I've tried spotting the profiles I need via LinkedIn but have had a fairly low success rate there since people think I'm trying to offer them a job and the message can't be too long, tips around this are also appreciated!