Answer:
Hello Uncle ____, It has been such a long time!
Lately i've been thinking back and really wanted to make the most of this quarantine to reconnect with everyone. Life is always so busy that I often forget how fast time really passes. How have you been? The last time saw you________. Please do tell me what you have been up to. Once this quarantine ends we really need to reconnect!
Step-by-step explanation:
This is just a general reconnection format. The factors behind why you haven't been in touch with your uncle will definitely change your tone. If it was a positive or negative break off. What your uncle's personality is like. Or what your personality is like will change the way your letter is worded.