1. The obligatory factor is communication!

2. Secondary factors are:

-2.1. Mutual understanding.
-2.2. Respect.
-2.3. Being able to show goodwill.
-2.4. Avoiding Aggression.
-2.5. Trust.

3. Equally important is sharing one's personal life.

-3.1. Exchange your photos.
-3.2. Sharing videos.
-3.3. Important life events.
-3.4. Discussing problems.
-3.5. Video calls with each other.

4. I think everyone loves surprises, and I think your significant other will always be happy with any surprise! Do not forget about it!

5. The most important aspect is to be able to love! After all, love is not just sending each other hearts, it is something more!

I am sure that all these tips will help you to achieve the maximum comfort with your other half as well as keep your love in spite of a lot of miles between you!