I agree, “no thank you” is the best. Most will take that as you aren’t interested while others will press you. Either you can ignore or just repeat the No answer. I think we all have first impressions based on looks which dismisses some great possibilities. The first is the hardest decision to make, it’s even harder if you are not comfortable on any level. You will soon see that you may have missed meeting fun couples.
Zoom meets are convenient not always the best way to see if you match. Most times you are going to meet those with more experiences, they should be aware you are just starting out. An innocent meeting, drinks or dinner will let you see if you are comfortable with people. We almost insist that a first meeting is just that, a first get to know meeting.
We still say No to invitations we aren’t comfortable with, a sixth sense, looks have become less of a qualifier as we went further into the LS. We have met great people that we most likely would have passed on at the onset. Good luck in your search. Maybe you will post how things progress.