First, I do believe you should live your life as a gift to the Lord.
A believer should support his church financially as the Lord has blessed him. You cannot out give the Lord.
My 1st pastor, after I was saved, preached tithing, but emphasized that it was not only money. He was fond of saying that the Lord desires 10% of your Time, Talent and Treasure.
However, I personally place no special significance to a particular value or percentage (tithe).
Part of my reasoning is that it is part of the old law. Under the Law, following all those rules letter by letter was to teach us righteousness. It is like teaching my sons to be good men by giving them specific rules. But as they matured, I expected them to look past the rules, and know that being good was not so much following all those rules as it was building character to judge right and wrong, even in situations where no rules had specifically been set. Its not that the rules are repealed, as much as they are made irrelevant.
So it is with giving to the church. The Old Testament rules about sacrificing and giving to the Lord were to teach us that we are to support our Lords ministry in our area. It’s not that at 9% you are lacking, but at 10% you are fulfilling all the Lord’s desires. In my case, giving 10% would not be sacrificial enough; while someone that is having trouble feeding their family should not be given an additional burden if they accept charitable assistance.
There are believers who start by debating whether it could be 10% of their gross income (first fruits) or 10% of their take-home pay or some other basis. If they are doing this kind of math, they are not really cheerful givers.
Under grace, the hardline rules are not really gone, but generalized into the Law of Love. Love of God, Love of neighbor, and Love of self (proper love, not narcissistic).
Beyond monetary giving to the church, I am increasing aware of those around me that have a much harder time making ends meet than I. Most of my working life, I only helped sporadically, but in my retirement I am making much greater efforts to spending time and effort in the aid of those around me.