One passage that completely destroys your position is Matt. 24:3:
"Now as He sat on the Mount of Olives, the disciples came to Him privately, saying, 'Tell us, when will these things be? And what will be the sign of Your coming, and of the end of the age?'"
The disciples clearly asked Christ to give them signs concerning His return. Everything Christ said from that point forward in the chapter was Him answering their questions about the last days. The reason why the apostles initially believed that time had come around A.D. 70 was because they didn't realize that those events were only a forerunner of what is supposed to happen in our future.
Another passage that destroys your position is Matt. 24:21-22:
“For then there will be great tribulation, such as has not been since the beginning of the world until this time, no, nor ever shall be. And unless those days were shortened, no flesh would be saved; but for the elect’s sake those days will be shortened."
In this passage, Christ talks about a time where weapons will become advanced enough to render humankind extinct within 3 years. That kind of technology certainly didn't exist in their day. Another indicator that Christ is speaking about His return lies in the fact that He referenced Dan. 12:1 for this portion of the prophecy, and Daniel was exclusively written for the modern era(Dan. 8:19, 10:1, 11:27, 35, 12:4, 7-9).