How to stand firm in the Lord in Phil 4:1?

[tonychanyt]

Philippians 3:20-4:1:

20 But our citizenship is in heaven, and from it we await a Savior, the Lord Jesus Christ, 21 who will transform our lowly body to be like his glorious body, by the power that enables him even to subject all things to himself. 1 Therefore, my brothers, whom I love and long for, my joy and crown, stand firm thus in the Lord, my beloved.

What did the word "thus" refer to?

that is how
οὕτως (houtōs)
Adverb
Strong's 3779: Thus, so, in this manner. Or (referring to what precedes or follows).

Berean Standard Bible:

Therefore, my brothers, whom I love and long for, my joy and crown, that is how you must stand firm in the Lord, my beloved.

How to stand firm in the Lord?

The immediate context was Jesus will save us by resurrecting us to our glorious body. We stand firm in the Lord with respect to this particular belief.