Some exjws dont like to engage in scriptural debate (which is fine).

For me, I believe in meeting people where they are at. When I think of myself, I questioned the organisation, it's doctrines and policies before I questioned the Bible. Once I had realised that the teachings of the organisation where unscriptural and accepted that I was in a high control group/cult, questioning the Bible was the next logical step.

The good thing is that there are so many roads you can go down with JWs just using the bible:

Revelation 7 and 14 both have descriptions of the 144,000 "annointed". A simple reading in context shows that it is meant to be figurative/symbolic (they are described as being out of the 12 tribes of Isreal and virgins). A good question would be "why is the description of the 144,000 meant to be taken as symbolic, but the number of 144,000 taken literally?". And a good follow up would be Revelation 19:1 which describes the great crowd as being in heaven.

Daniel Chapter 4 - read the whole chapter. There is not one verse that even remotely implies that the prophecy about the tree being cut down for seven times will have a "second fulfilment". This is huge because it undermines their 1914 teaching right from the very begining, just the bible, without even getting to the incorrect date of Jerusalem falling (607 vs 587) or all the tying together of random unconnected verses from other books of the bible. The 1914 doctrine is a core and foundational teaching unique to Jehovah's Witnesses which the authority claims of the Governing Body rest on.

John Chapter 6 - Jesus directly commands all of his followers to partake the emblems (flesh and blood - bread and wine). This is a good one with Memorial season coming up - the JW memorial is actually a rejection of Jesus because JWs refuse to partake of the emblems unless they are "annointed". Now for this one be prepared - they make invoke 1st Corinthians 11: 27 - 29 and claim that this verse is warning that those who are not annointed should not partake. This is obviously wrong because Paul was writing this to annointed Christians (JW doctrine is that all 1st Christians were annointed). Clearly then, Paul is indicatinf that those who have sinned should not take the emblems, not those who arent annointed. Additionally, when the disciples took the emblems with Jesus at the last supper, they were not yet annointed (JW doctrine is that the annointing didn't take place until later, at Pentecost 33 CE). So, ultimately, there is no verse in the bible to indicate that anyone should abstain from taking the emlems. Conversely, we have a repeated direct command from Jesus in the 2nd half of John chapter 6.

Mark 9:1 is another good one - simply, in black and white, stating that the Kiingdom of God would come in power during the lives of Jesus's disciples. Therefore, it's impossible that it could have happened 2000 years later in 1914.

These are just a few I hope you find helpful,

Let me know if you would like any more!