Solderless Connectors Issue

I wanted to know if anyone had any good tips, tricks to get the solderless connectors to keep their connections? I have 1 connector I have to use, but 85% of the led strips are after the connector. Its a 3 pin connector and I have both sides of the led strip in the connector and I've even pushed down on all the pins. They are making contact on both sides and I cannot pull the strips back out without force as they held down....but when turned on, no lights after the connector unless I grab and squeeze the connector with my fingers, then all is well.

Any good ideas on what I could do to somehow make the squeeze on those connections tighter? Very confusing as they are touching copper on both ends tightly even with the connector open, so I dont know why squeezing them makes them work...

https://www.amazon.com/dp/B0D17GZR9Q?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

Its just the standard one to one connector, no angle or anything else.