After COVID etiquette is really important because many of us have been in isolation for two years and not mixing with a lot of other people. Below are a few suggestions of things to be aware of:

Mobile Phones

Be aware of the people around you when on your mobile.  We have had two years of being on our own and being able to discuss any intimate subject we like, but now we must remember that other people can hear our conversations.   
 

Sharing Space

During the pandemic we kept a 1.5 metre distance from other people on buses and trains. This was not too difficult to do as not a lot of people were using public transport. But now most people have gone back to work (even if for some of the week) and transport is filling up. It is therefore unacceptable to dump bags on adjacent seats, especially if you do not remove them when you see people standing. People should never be forced to ask you to move your bags.
 

Eating Out

Everyone has been happy to be socialising in restaurants again, and gatherings are the order of the day. But don’t let your excitement carry you away. Remember that you are sharing a public space with fellow-diners and if your group gets really noisy you’re likely to be disturbing people at nearby tables.
It is very easy to let your children do their own thing when you are having a good time. Of course, you want them to have fun too, but it really is imperative that you keep an eye on them and ensure that they’re not spoiling other people’s enjoyment.
 

Body Language

After COVID etiquette also means being conscious of yourself
Be aware of what your body language is saying.
Your first impression is so important:
Appearance, voice, handshake, eye contact, deportment, body language and facial expressions.
Don’t be creepy by standing too close or touching people you don’t know well, not making eye contact, have a sweaty and limp handshake and lack a facial expression.
Don’t fidget or fiddle
But don’t over-compensate either.
Take the middle ground
Be interested in the other person (don’t be looking over their shoulder to see if there is someone better to talk to)
Eliminate all signs of self-consciousness