Member of the local Chambers on the theory that whatever helps the area trickles down to me and it does put me on their websites.
Trends come and go, what works this year may not do a well in the future. Web banner on an area attraction site was the first thing that seemed to do really well for me, but over time the price went up and the results delined.
TA was wonderful for a while as our rating placed us near the top of the list, while our rating is still the same their present numbering system includes the volume of reviews and as a tiny place we got lost way down in their list, still a help if someone reads down the list, but I don't hear as many comments.
This year seems slower than the last few, but maybe just a cycle as I see that same comment from others, our prices are up a little and there is a new hotel in town this year, maybe no reason to get excited.
I have not yet tried OTAs so I can't speak to how they might help