There's a range of outcomes for hot guys on Instagram, Grindr etc.
1 No interest in meeting. Might be:
Not gay
Has a boyfriend
Is not a money boy (remember only in Pattaya do we find a large percentage of lads working as money boys)
Even where they are money boys, some choose to only meet people near their own age. There's one lad in Pattaya who I've only ever seen with farang who look under 35 years old. The same guy also appears to be running a massage shop AND a restaurant.
2 Could be interested in meeting, but has plenty of other clients at present.
3 Willing to meet
I prefer to search on Grindr or Hornet. In the case of Grindr, firstly tidy up the screen by blocking all the lady boys and other no hopers, then browse what remains.