If... you really WANT to reinstated....each hall will be a little different.
Since most JW elders are not the world's most literate group...moving a few times (for work, sick parents, etc.) tends to improve the chances of records being lost and letters becoming more brief.
I have seen a number of people get reinstated and accepted over the years. Like with most any group, donating $$ visibly in the box by CHECK seems to help since a couple of brothers will see them and possibly discuss them. Visibly participating, spreading a bit of $$ around (meals, etc.), telling a few funny stories, G-rated jokes, and being generally low-key, and amicable.
Personally, as I have aged, I can no longer stomach kissing up to people I do not like or respect...it makes me ill.