Don’t assume that your airport is going to look or feel the same as it did before.
Don’t take out your frustrations on the people who work at the airport, hotel, etc.
Remember that we are all in this together; it is not designed to frustrate only you.
Do extra research on travel/government websites at your destination country to see what their current rules are. They are likely not quite the same as the rules in your home country.
Continue to check those websites right until you depart. Also check your home country rules and practices for when you return. Do you need a proof of vaccination? Do you need a Covid test before flying?
If you only have a paper, hand-written vaccination card, you need to go online where you received the vaccinations and get an electronic card with QR code for travel.
Don’t assume the hotel staff will know how to help you with local Covid requirements. Have a Plan B (and C & D) at the ready.
Remember, you are choosing to travel for the pleasure of it, so enjoy that pleasure even when it comes to you disguised as something else.
Most of all, enjoy the scenery, the people, the culture of where ever you go, starting in your home airport or train station.