God is with us! God is indeed willing and able to be with us, His children! However "physically" would be a trivial way of doing it. The real important essence of a man is his soul. And Jesus had said He would dwell in our souls dynamically by the infilling of the Holy Spirit (which is God!). The charismatic dimension of Christianity must not be neglected in this discussion,
The Spirit of truth...He dwelleth with you, and shall be in you. I will not leave you comfortless, I will come to you. (John 14:17,18)
Baptism of Holy Spirit Jesus promised that He would not leave His disciples as orphans! By the Baptism of the Holy Spirit God is able to be with us no matter where we are: in church, at home, incarcerated in jail, on the stormy main, in the adverse university... anywhere. Whereas, if He were only physically available, he could appear to just one person at a time... unless He cloned Himself. Jesus could only be with a person, say in Cambodia, and the rest of the nations would not be with Him. Even if Jesus travelled often, continuously, He would not be able physically to meet with each and every believer every year!
This is why Jesus insisted the disciples not leave Jerusalem until they were filled with the Holy Spirit. (Acts 1:4-5) It is so important to each believer, as your sincere interest is exemplified by asking this question. Seek Charismatic relief as prescribed by the personable God Himself.
At the right time This is what the Bible stated in Galatians, Jesus came at the right time... (Galatians 4:4) I'm sure we all would realize that if Jesus came during the 21st century, with all its technological wizardry, that every miracle He did would be dismissed by sceptics as merely digital trickery. People seeing Jesus today could not be sure if it were AI or the real Jesus talking to them.
If Jesus came sooner than the 1st century, He would not have fulfilled the date-constrained prophecies of the Old Testament. (See Daniel's prophecy, chapter 9) Also, Jesus had to arrive when there was a Temple (a requirement of Malachi); He had to come when genealogical records existed (to prove He was a son of David; the Temple with all its records was destroyed in 70 A.D.). He had to come when crucifixion was a mode of capital punishment (Isaiah 53).
Jesus came at the right time, logistically, as well. Because of the Diaspora, (scattering of the Jews), and inability of Jews to travel all the way to the Temple in Jerusalem, the synagogue form of worship proliferated! There were synagogues in villages and cities throughout the whole Mediterranean landscape, as well as the land of Judea. This made it quite functional for the spread of the Gospel by Jesus and Hid Apostles. They were able to proclaim the Good News to gathered Jews everywhere with no logistical hinderances. (Mathew 4:23, 9:35, 12:9, 13:54; Acts 9:20, 13:5,14, 14:1, 15:21, 17:1, 18:4, 26, 19:8)
And others have noticed the benefit of Jesus coming in the first century: the Greek language was known all throughout the Roman Empire: the Lingua franca was Greek, and it could be spoken and written by all the educated people that Jesus and the Apostles preached to. Thus also, the New Testament was written in this universal language.
So Jesus came at the right time...and He left in the right way...giving the Holy Spirit Presence to all His disciples!
At the Right Place Jesus came to Israel (Jerusalem) because that is where most of the supernatural prophecies were to find their fulfilment. If He showed up anywhere else, there would be no evidence for us to examine as proof of His deity. Neither Peru or Nigeria nor Germany, etc. had the Scriptures for us to test Jesus's claims.
Also, the land Province of Syro-Palestine was located in the crossroad of the civilized Roman empire. Paths going north and south (Turkey to Egypt) and trade routes east and west (Persia to Spain) went through this Jewish land. (Compare Matthew 8:11, Acts 2:5-11, long list of nations!)) Jesus appearing here was quite convenient...Providential.
[For important and exciting research, read Acts 1, John 14-17, 1 Corinthians 12-14]