See the connection you feel with each other
When you live far away, contact becomes an important channel to connect your relationship. However, one person may feel comfortable exchanging short greetings frequently, while another may prefer to talk fully in leisurely phone calls. It's impossible to say for sure which method means a more serious relationship.
Express your feelings by saying, “I was disappointed that I couldn’t contact you,” but try to explain in detail what you want before concluding that the other person is not into you. Actionable requests, like “I want to have a couple of video calls this week before I go to bed,” are easier to adjust to than vague expectations.
Be realistic about your contact methods
Write down the time difference between the two of you, your work/study hours, and the time you need to rest. Rather than aiming for long phone calls every day, you can combine regular free calls with short hellos that each person can stick to. If you're busy, let them know in advance and set a time for your next contact so they don't have to keep guessing.
You can also try ways to share your individual lives, such as eating together online or watching the same movie and sharing your thoughts. Just make sure you both enjoy the new activity so it doesn't become another obligation. If the agreement becomes burdensome, it is okay to adjust the frequency or time.
Preparing for a visit and change
When planning a visit, you should discuss not only the date but also travel costs, vacation time, lodging, physical strength, and your individual itineraries. See if there is a structure where one person is always on the go and in charge of preparations, and agree on how to divide the costs and effort, to the extent possible.
If you don't yet know when or how your long-distance situation will change, it's better not to make promises about an indefinite future. Instead, you can decide when to check next and what conditions are necessary for the decision. For example, you might decide to discuss dates and occupancy again in a few months.
The difficulties of long-distance relationships are not explained by one MBTI type. Rather than the number of contacts, look at whether you two feel safe and respected, and whether you realistically keep and adjust your promises.