constantly being ignored at establishments

female late 30s currently in Manila several months for business meetings/training, from the US. more specifically, staying in the Eastwood area. over the last few weeks I have had well more than a handful of experiences where I arrive at a restaurant, ask for a table for one, am seated and then ignored for 45+ minutes and never served. sometimes busy locations, sometimes not, but often several servers make eye contact and turn away to serve other tables. I am polite and dressed conservatively and appropriately as far as I am aware. after 45+ minutes and at least one polite attempt to let the server know my order has not been taken, I will get up quietly and leave without seemingly any acknowledgement from hosts as I exit. I have begun to assume that this may be due to one of the following: -very fair skinned and pretty obviously american -overweight about 40 lbs by American standards - arriving and dining alone as a female

I'm unaware of what I am doing wrong in these instances. I'm clearly the visitor/guest in another country and trying to assimilate to the culture so I mostly just let it go, but as it reoccurs am trying to understand what to do differently. I have had several other experiences ( dive bars, regular bars and upscale bars, etc) where this doesn't occur, all throughout QC and Makati, and I always tip well, so 🤷