Always bear in mind that your own resolution to succeed is more important than any other.

Encouragement from other people is pleasant and it does not survive a bad month. What continues after everyone else has lost interest, including those who believed in you at the start, is whatever you decided for yourself. That is why the internal commitment carries more weight than any amount of external support, though support helps and there is no honour in refusing it.

A useful test is whether you would still be doing this if nobody knew. If the answer is no, the motivation is currently borrowed, and borrowed motivation runs out. Find the part you would want even unobserved, and build outward from there.